
707 N.E.2d 125 (1998)
302 Ill. App.3d 807
236 Ill.Dec. 280
In re MARRIAGE OF Donald J. Burgess, Petitioner-Appellee, and
Sharron M. Burgess, Respondent-Appellant.
No. 1-97-4311.
Appellate Court of Illinois, First District, Second Division.
December 22, 1998.
*126 Shannon M. Cobe, Chicago Volunteer Legal Services, Chicago, for Appellant.
A. Marcy Newman, Susan Lorraine Kennedy, Chicago, for Appellee.
Justice RAKOWSKI delivered the opinion of the court:
Can a disabled adult's plenary guardian (a guardian of both the individual's estate and person) continue a dissolution of marriage action originally filed by the disabled adult prior to the filing of a petition for guardianship and prior to a finding of disability? This is the certified question involved in this appeal. Pursuant to In re Marriage of Drews, 115 Ill.2d 201, 104 Ill.Dec. 782, 503 N.E.2d 339 (1986), the answer is no and, accordingly, we reverse and remand.

BACKGROUND
Petitioner, Donald Burgess, 64, and respondent, Sharron Burgess, 58, were married in 1978. No children were born of the marriage. Donald filed a petition for dissolution in April of 1996, alleging repeated acts of mental cruelty. Sharron answered, denying the allegations. In June of 1997, the probate division of the circuit court entered a finding that Donald was disabled and appointed his sister, Virginia Cronk, as plenary guardian. Sharron then filed a motion to dismiss the dissolution petition, contending that Cronk was without authority to continue with the proceeding. The trial court denied the motion but certified the question. We granted leave to appeal pursuant to Supreme Court Rule 308 (155 Ill.2d R. 308), accepting the parties' certified question.

ANALYSIS
Preliminarily, under the Illinois Probate Act of 1975, there are two types of guardians: guardians of the person (755 ILCS 5/11a-17 (West 1996)) and guardians of the estate (755 ILCS 5/11a-18 (West 1996)). A guardian of the person is appointed when a disability, as defined in section 11a-2, causes an individual to "lack[] sufficient understanding or capacity to make or communicate responsible decisions concerning the care of his person." 755 ILCS 5/11a-2, 5/11a-3 (West 1996). A guardian of the estate is appointed when, due to a disability as defined in section 11a-2, the individual "is unable to *127 manage his estate or financial affairs." 755 ILCS 5/11a-2, 5/11a-3 (West 1996). Section 11a-17 sets forth the powers of the guardian of the person and section 11a-18 sets forth the powers of a guardian of the estate. As previously stated, the instant case involves a plenary guardian, who is a guardian of both the individual's estate and of the individual's person.
In In re Marriage of Drews, 115 Ill.2d 201, 207, 104 Ill.Dec. 782, 503 N.E.2d 339 (1986), our Illinois Supreme Court held that a plenary guardian lacks standing to institute or maintain a dissolution proceeding. When Drews was decided, a majority of states to consider the issue were in accord with this result. The supreme court stated that Illinois had long ago adopted the majority approach and that, "absent statutory authorization, a guardian cannot institute an action, on behalf of a ward, for the dissolution of the ward's marriage." Drews, 115 Ill.2d at 205, 104 Ill.Dec. 782, 503 N.E.2d 339. Rejecting the guardian's argument that section 11a-18(c) confers standing, the court found that this section relates only to estate matters, not to matters of the person. This section's authorization of standing does not encompass all legal proceedings, only those that involve financial matters. Drews, 115 Ill.2d at 206, 104 Ill.Dec. 782, 503 N.E.2d 339. Section 11a-17 addresses the guardian's duties pertaining to personal matters and nothing in that provision "grants the guardian standing to maintain or defend any legal proceeding." (Emphasis in original.) Drews, 115 Ill.2d at 206, 104 Ill.Dec. 782, 503 N.E.2d 339.
As previously noted, when Drews was decided, the majority rule in the country was that a guardian could not institute a dissolution proceeding. Times have changed, however, and a majority of jurisdictions to address the issue (17 of 29)[1] now allow a personal guardian to bring or maintain a dissolution action. We also note from a review of these decisions that sound legal and public policy considerations have been offered in support of this position. See, e.g., Ruvalcaba v. Ruvalcaba, 174 Ariz. 436, 850 P.2d 674 (App.1993); In re Marriage of Gannon, 104 Wash.2d 121, 702 P.2d 465 (1985). See also Drews, 115 Ill.2d at 208-09, 104 Ill.Dec. 782, 503 N.E.2d 339 (Simon, J., dissenting); In re Marriage of Drews, 139 Ill. App.3d 763, 778, 94 Ill.Dec. 128, 487 N.E.2d 1005 (1985) (Jiganti, P.J., dissenting).
However, the language of Drews is clear: "[No statutory provision] regulating guardianship for disabled adults * * * accord[s] a guardian, limited or plenary, the standing to maintain an action for the dissolution of a ward's marriage." Drews, 115 Ill.2d at 206-07, 104 Ill.Dec. 782, 503 N.E.2d 339.
Standing is defined as:
"`Standing to sue' means that party has sufficient stake in an otherwise justiciable controversy to obtain judicial resolution of that controversy. [Citation.] Standing is a concept utilized to determine if a party is sufficiently affected so as to insure that a justiciable controversy is presented to the court; it is the right to take the initial step that frames legal issues for ultimate adjudication *128 by court or jury. [Citation.] * * *
Standing is a requirement that the plaintiffs have been injured or been threatened with injury * * * and focuses on the question of whether the litigant is the proper party to fight the lawsuit, not whether the issue itself is justiciable." Black's Law Dictionary 1405 (6th ed.1990).
The Drews court articulated an absolute rule based on lack of standing rooted in the reasoning that a guardian is a creature of statute with only those powers granted to it and, thus, is without standing to do anything beyond its specific grant of authority.
Donald contends there is a fundamental distinction between institution of an action (as in Drews) and continuation or maintenance of an action (at issue here). Maintain is defined as: "[t]o maintain an action or suit may mean to commence or institute it; the terms imports the existence of a cause of action. Maintain, however, is usually applied to actions already brought, but not yet reduced to judgment." Black's Law Dictionary 953 (6th ed.1990). Further, "[t]o `maintain' an action is to uphold, continue on foot, and keep from collapse a suit already begun, or to prosecute a suit with effect." Black's Law Dictionary 953 (6th ed.1990). Although the statement that a plenary guardian is without standing to maintain an action for dissolution may be dicta, under the facts of Drews, it is nevertheless a clear expression by our supreme court. Moreover, neither section 11a-17 nor 11a-18 makes any reference to either instituting or maintaining a dissolution proceeding. Given that the rationale in Drews is that, absent statutory authorization, the guardian cannot act, any argument that a different result should be reached in this case because it involves maintaining an action is without merit.
Donald additionally points out that Illinois has recently granted additional powers to a personal guardian. In particular, a guardian is now allowed to withdraw medical treatment (see Health Care Surrogate Act (755 ILCS 40/1 et seq. (West 1996)); 755 ILCS 5/11a-17(d) (West 1996)), a decision Donald argues is much more personal than the decision to seek a divorce. We agree that this argument has appeal from the standpoint of logic. However, we are also quick to note that these additional powers were granted precisely in the manner the Drews court mandated: via statutory authorization. Thus, this appeal to logic would be better served if made to the legislature.
Since Drews, section 11a-17 has been amended three times. In 1987, the legislature added the surrogate decision-making powers referred to above. 755 ILCS 5/11a-17(d) (West 1996). In 1991, the legislature added powers in connection with the Illinois Power of Attorney Act. 755 ILCS 5/11a-17(c) (West 1996). Finally, in 1997, the legislature added a paragraph detailing the standard for decision making a guardian must follow. 755 ILCS 5/11a-17(e) (West Supp.1997). Clearly, the legislature has granted a personal guardian greater authority in certain areas. However, it failed to do so in the area of dissolution actions. The legislature is presumed to know the construction the courts have placed upon a statute. Williams v. Crickman, 81 Ill.2d 105, 111, 39 Ill.Dec. 820, 405 N.E.2d 799 (1980). A judicial interpretation of a statute is considered part of the statute until the legislature amends it contrary to that interpretation. Charles v. Seigfried, 165 Ill.2d 482, 492, 209 Ill.Dec. 226, 651 N.E.2d 154 (1995). Moreover, when the legislature has acquiesced in the judicial construction over a substantial period of time, as it did here, to depart from that construction would be tantamount to an amendment of the statute itself. Charles, 165 Ill.2d at 492, 209 Ill.Dec. 226, 651 N.E.2d 154. This we cannot do. The power to amend is exclusively a legislative function.

CONCLUSION
Based on the foregoing, we answer the certified question in the negative and hold that a plenary guardian may not continue a dissolution action originally filed by his or her ward prior to the time the ward was found disabled. Accordingly, we reverse the judgment of the circuit court of Cook County and remand the cause for further proceedings consistent with our opinion.
Reversed and remanded.
COUSINS, J., concurs.
*129 Justice TULLY, specially concurring:
I specially concur because while I agree that we are bound by the supreme court's decision in In re Marriage of Drews, 115 Ill.2d 201 (1986), 104 Ill.Dec. 782, 503 N.E.2d 339, I would emphasize the strong legal and public policy reasons for allowing a disabled adult's plenary guardian to continue a dissolution of marriage action originally filed by the disabled adult.
I would echo the dissent in Drews, which argued that such guardians should be allowed to initiate, let alone maintain, a dissolution of marriage action on the disabled adult's behalf. According to that dissent, a marital dissolution action is not too personal to fall within the guardian statute (755 ILCS 5/11a-1 et seq. (West 1996)). The purpose of a plenary guardianship is to preserve the disabled adult's best interests and to protect him or her from "neglect, exploitation, or abuse." 755 ILCS 5/11a-3(b) (West 1996). Not allowing a plenary guardian to maintain a marital dissolution action originally filed by the disabled adult does not serve these goals. "By allowing guardians to make such decisions regarding dissolution actions, a court preserves `the dignity and worth of such a person [an incompetent] and affords to that person the same panoply of rights and choices it recognizes in competent persons.'" Drews, 115 Ill.2d at 208, 104 Ill.Dec. 782, 503 N.E.2d 339 (Simon, J., dissenting), quoting Superintendent of Belchertown State School v. Saikewicz, 373 Mass. 728, 746, 370 N.E.2d 417, 428 (1977).
Also, the Drews dissent questioned the authority upon which the majority relied. "The two Illinois cases on which the majority relie[d] in holding that a guardian lacks standing to initiate a dissolution action [Pyott v. Pyott, 191 Ill. 280, 61 N.E. 88 (1901); Iago v. Iago, 168 Ill. 339, 48 N.E. 30 (1897)] were written during a time when divorces were relatively infrequent and much more difficult to obtain." Drews, 115 Ill.2d at 208, 104 Ill.Dec. 782, 503 N.E.2d 339 (Simon, J., dissenting). The dissent stated that the majority used "an overly narrow reading of the [guardian] statute that is neither in the best interest of the ward or the public."
In addition, I agree with the Drews dissent that maintaining a dissolution action is no more personal than making medical decisions. "(I)n these days of termination of life support, tax consequences of virtually all economic decisions, no-fault dissolutions and the other vagaries of a vastly changing society, we think an absolute rule denying authority is not justified nor in the public interest." In re Marriage of Gannon, 104 Wash.2d 121, 702 P.2d 465, 467 (1985). As petitioner pointed out in his appellee's brief, the Probate Act specifically authorizes a guardian to act as a surrogate decision maker under the Health Care Surrogate Act. 755 ILCS 5/11a-17(d) (West 1996). The Health Care Surrogate Act allows the surrogate to authorize the withdrawal of medical treatment. 755 ILCS 40/20 (West 1996). Thus, I would find the argument that initiating or maintaining a dissolution action on a ward's behalf is too personal to fall within the guardian statute to be unpersuasive.
It is important to note that of the 29 jurisdictions addressing the issue, 17 allow a guardian to institute a dissolution proceeding on the ward's behalf, and some of those stipulate that the ward must be able to exercise reasonable judgment as to his or her personal decisions and to unequivocally express a desire for dissolution. Ten of the 29 jurisdictions, including Illinois, do not allow a guardian to institute dissolution proceedings. Most of those jurisdictions have not considered the issue since the 1950's. Two of the 29 jurisdictions are undecided on the issue. Certainly Drews no longer reflects the majority view.
Moreover, allowing a guardian to maintain such dissolution actions preserves equity between the disabled adult and the spouse because otherwise, "`the competent party is vested with absolute, final control over the marriage.'" In re Marriage of Ruvalcaba, 174 Ariz. 436, 850 P.2d 674, 681 (1993), quoting Gannon, 104 Wash.2d 121, 702 P.2d at 467. The court in Ruvalcaba was also concerned about "leaving an incompetent spouse captive to the whims of the competent spouse, and the specter of potential for abuse." Ruvalcaba, 174 Ariz. 436, 850 P.2d 674, 681 (1993). In Gannon, the court also *130 addressed the question, as in this case, whether the guardian had standing to seek a marital dissolution on behalf of a legally incompetent spouse. The court set forth an equitable method of resolving the issue:
"In cases in which the guardian * * * believes a dissolution to be in the best interests of the incompetent ward, such authority must be sought specifically by a special petition for that purpose. The court must then hold a hearing to obtain evidence of what action is in the best interests of the ward. The discretion of the trial court will test these matters, again with great emphasis upon the interests of the ward and the necessities and interests of the competent spouse." Gannon, 104 Wash.2d 121, 702 P.2d at 467.
Finally, I would emphasize that although we are bound by the decision in Drews, the facts of this case illustrate the need for a change in the law to allow plenary guardians to maintain marital dissolution actions on their wards' behalf. The record shows that petitioner had expressed his desire for a divorce for approximately 14 months before he became disabled. In addition, there is evidence that, even after being deemed disabled, he retained some mental capacities as well as the ability to live on his own. The result we are required to reach leaves petitioner powerless over his own life.
NOTES
[1]  See Hopson v. Hopson, 257 Ala. 140, 57 So.2d 505 (1952); Campbell v. Campbell, 242 Ala. 141, 5 So.2d 401 (1941); Ruvalcaba v. Ruvalcaba, 174 Ariz. 436, 850 P.2d 674 (App.1993); In re Marriage of Higgason, 10 Cal.3d 476, 516 P.2d 289, 110 Cal.Rptr. 897 (1973); Northrop v. Northrop, No. CN 94-9882, 1996 WL 861489 (Del.Fam.Ct. December 30, 1996); Vaughan v. Guardianship of Vaughan, 648 So.2d 193 (Fla.App.1994); McGrew v. Mutual Life Insurance Co., 132 Cal. 85, 64 P. 103 (1901) (interpreting Hawaii law); Cohn v. Carlisle, 310 Mass. 126, 37 N.E.2d 260 (1941); Smith v. Smith, 125 Mich.App. 164, 335 N.W.2d 657 (1983); In re Parmer, 755 S.W.2d 5 (Mo.App.1988); Nelson v. Nelson, 118 N.M. 17, 878 P.2d 335 (App.1994); Pace v. Pace, 32 Ohio App.3d 47, 513 N.E.2d 1357 (1986); In re Marriage of Ballard, 93 Or.App. 463, 762 P.2d 1051 (1988); Syno v. Syno, 406 Pa.Super. 218, 594 A.2d 307 (1991); Murray v. Murray, 310 S.C. 336, 426 S.E.2d 781 (1993); Turner v. Bell, 198 Tenn. 232, 279 S.W.2d 71 (1955); Wahlenmaier v. Wahlenmaier, 750 S.W.2d 837 (Tex.Ct.App. 1988); In re Marriage of Gannon, 104 Wash.2d 121, 702 P.2d 465 (1985).

Of the 17 jurisdictions that allow institution, four allow such action pursuant to express statute or rule (Florida, Massachusetts, Michigan, and Missouri). Eight appear to allow the action outright (Alabama, Arizona, Hawaii, New Mexico, Oregon, Tennessee, Texas, and Washington); and five require some degree of competency on the part of the ward to express a desire for dissolution (California, Delaware, Ohio, Pennsylvania, and South Carolina).
