In Illinois, there is no age at which a child can choose which parent to live with. A judge decides parenting time based on the child’s best interests, and the child’s wishes are one factor on a longer list. Older, more mature children who can clearly explain their reasoning tend to be listened to more closely, but the decision belongs to the court until the child turns 18.
What the Statute Actually Says About a Child’s Wishes
The Illinois Marriage and Dissolution of Marriage Act tells judges to consider “the wishes of the child, taking into account the child’s maturity and ability to express reasoned and independent preferences.”1FindLaw. Illinois Statutes Chapter 750 Families 5/602.7 – Allocation of Parental Responsibilities: Parenting Time Notice what the statute does and does not do. It requires the judge to hear the child out. It does not tell the judge to follow the child’s lead, and it sets no age at which the preference controls.
That same section lists more than a dozen best-interest factors the court weighs alongside the child’s preference, including each parent’s own wishes, how well the child has settled into their home, school, and community, the mental and physical health of everyone involved, and each parent’s willingness to support the child’s relationship with the other parent.1FindLaw. Illinois Statutes Chapter 750 Families 5/602.7 – Allocation of Parental Responsibilities: Parenting Time A child’s stated preference that runs against several of these factors will usually lose. A 15-year-old asking to live with a parent whose home is unstable, or with a parent who has actively undermined the other, is unlikely to get what they want no matter how firmly they say it.
What Makes a Child’s Preference Persuasive
Because no birthday flips a switch, judges do real work to gauge whether a particular child’s opinion should carry weight. This is where these disputes are won and lost. A thoughtful 12-year-old can move a case more than a 16-year-old who sounds coached or who simply prefers the house with fewer rules.
Judges look for a few things. Can the child describe the practical differences between each home in concrete terms, meaning schoolwork, sleep, friends, routine? Do they show any awareness of what their choice means for the relationship with the other parent? Are the reasons consistent over time? A child who gives the same explanation in October that they gave in June is far more persuasive than one whose story shifts with whichever parent they saw last.
Preferences that read as coached are discounted. So are preferences that seem driven by short-term friction, like a recent grounding, or by material perks. Preferences grounded in stability, in relationships, or in the child’s own daily life tend to be taken seriously well before the child reaches their late teens.
How the Judge Hears From the Child
Children rarely testify in open court in Illinois parenting cases. The court has quieter ways of finding out what a child thinks.
In-Camera Interviews
The most common method is an in-camera interview, meaning a private conversation between the judge and the child in chambers with neither parent present. It removes the pressure of speaking in front of both parents and lets the judge ask follow-up questions to test whether the preference is genuinely the child’s own.2Loyola University Chicago Law Journal. Out of the Mouths of Babes: Determination of Child Custodial Preference in Illinois
Professional Evaluations
Courts also use psychologists, social workers, and other mental health professionals to evaluate the child. These evaluations go further than a single conversation and can distinguish a reasoned preference from one driven by anxiety, loyalty conflicts, or a parent’s coaching. The report gives the judge a fuller picture than a chambers chat can produce on its own.
Guardians Ad Litem and Child Representatives
In contentious cases, the judge can appoint a Guardian ad Litem or a Child Representative. Both are attorneys, and both serve the child rather than either parent, but they do different jobs.
A Guardian ad Litem investigates by interviewing the child, both parents, teachers, and others with useful information, then reports findings and recommendations to the judge. The recommendation reflects what the GAL believes is in the child’s best interests, which may or may not match what the child says they want.3Circuit Court of Cook County. Guardians Ad Litem, Child Representatives, and Attorneys for Child in Domestic Relations Cases
A Child Representative goes further and acts as an attorney in the courtroom, presenting evidence, questioning witnesses, and making arguments. A Child Representative must consider the child’s wishes but is not bound by them.3Circuit Court of Cook County. Guardians Ad Litem, Child Representatives, and Attorneys for Child in Domestic Relations Cases In high-conflict cases with dueling narratives from the parents, an independent lawyer focused only on the child often shapes the outcome.
When a Child’s Changing Preference Can Reopen the Case
Parenting orders are not permanent. As children get older and their circumstances change, either parent can ask the court to modify the arrangement. Illinois puts guardrails on how quickly that can happen.
The Two-Year Bar on Decision-Making Changes
For decision-making responsibilities, a parent generally cannot file a modification within the first two years after the order is entered. The only exception is when the child’s current environment seriously endangers their mental, physical, or emotional health. That high bar exists to keep parents from relitigating the same fight right after they lose it.4Illinois General Assembly. 750 ILCS 5/610.5 – Modification
Parenting Time Can Be Revisited Sooner
Parenting time is different. It can be modified at any time without meeting the serious endangerment standard. The parent asking for the change has to show that circumstances have changed and that the new arrangement would serve the child’s best interests.4Illinois General Assembly. 750 ILCS 5/610.5 – Modification
A teenager’s shifting preferences can be part of that changed-circumstances picture, but the preference alone is rarely enough. The court will look at what has actually shifted in the family’s life and whether the proposed schedule is genuinely better for the child. The judge may appoint a Guardian ad Litem or Child Representative again to take a fresh, independent read of the situation.
How a Change in the Schedule Can Move Child Support
If a child’s preference produces a real shift in the parenting schedule, the money can move with it. When each parent has the child for at least 146 overnights per year, Illinois treats the case as “shared physical care.” The basic support obligation is multiplied by 1.5 and then allocated between the parents based on their incomes.5FindLaw. Illinois Statutes Chapter 750 Families 5/505 – Child Support; Contempt; Penalties
Crossing the 146-night threshold in either direction can change the numbers meaningfully. Either parent can request a support modification when the parenting arrangement changes, and as a general rule the support amount has to change by at least 20 percent for the court to approve an adjustment.6HFS Illinois Department of Healthcare and Family Services. Request a Modification A child support review cannot rewrite parenting time or decision-making. Those require a separate proceeding.
A Note on Terminology
Illinois no longer uses the word “custody” in its statutes. In 2016 the state replaced “custody” and “visitation” with “allocation of parental responsibilities” and “parenting time.” What used to be called legal custody is now “significant decision-making responsibility,” covering education, healthcare, and religion. What used to be physical custody is now “parenting time,” meaning the schedule of when the child is with each parent. Lawyers and parents still say “custody” in conversation, but court orders and filings use the newer terms.