In Illinois, unmarried parents can have the same rights to their child as married parents — but only after legal parentage is established. Until that one step is done, the parent who gave birth holds all parental responsibilities by default. The other parent has no rights a court will enforce.
That gap is the whole ballgame, and most people don’t know it exists. Below, we’ll walk through where you stand right now, why parentage is the gate you have to clear first, how to clear it, and the specific steps that protect your time with your child.
We were never married — who has custody of our child right now?
The parent who gave birth is a legal parent automatically. An unmarried father is not — not until he establishes legal parentage — which means that, right now, the mother holds parental responsibilities by default.
First, a vocabulary fix that matters. Illinois got rid of the word “custody” in 2016. Under 750 ILCS 5/600, the law now uses “parental responsibilities.” That term is an umbrella covering two separate things: parenting time (the schedule — when the child is with you) and significant decision-making (who decides the big issues). So when you searched “custody,” what you’re really asking about is how those two things get allocated.
Here’s the part that catches unmarried fathers off guard. The person who gives birth is recognized as a legal parent the moment the child is born (750 ILCS 46/201). An unmarried father gets no such automatic recognition. And Illinois law spells out the default plainly: when there’s no court order allocating responsibilities, all parental responsibilities are presumed to belong to the mother (750 ILCS 46/802(c)).
Read that as temporary, not permanent. It doesn’t mean you lose. It means you don’t yet have the legal standing to make demands — and that changes the moment you establish parentage.
Why do I have to establish parentage before I have any rights?
Because Illinois only recognizes a parent-child relationship through specific legal channels. Marriage creates it automatically; unmarried parents have to create it on purpose. Without it, you have no standing to walk into a courtroom and ask for parenting time at all.
The reason married parents skip this step is a legal presumption. Under 750 ILCS 46/204, a person married to (or in a civil union with) the parent who gave birth is presumed to be the child’s parent. No marriage, no presumption. That’s the entire difference — and it’s why an involved, present, everyday father can still find himself legally invisible until he files the right paperwork.
Think of parentage as the gate. Everything you actually want — a parenting schedule, a say in your child’s education and medical care, the right to object if the other parent tries to move — sits on the far side of it. It’s the parentage judgment itself that lets a court address the allocation of parental responsibilities and parenting time (750 ILCS 46/802). Clear the gate first, or nothing else is available to you.
How do we establish parentage in Illinois?
There are two main routes for unmarried parents. Sign a Voluntary Acknowledgment of Parentage if you both agree, or ask a court to adjudicate parentage if you don’t.
Voluntary Acknowledgment of Parentage (VAP)
This is the fast, out-of-court route when both parents agree who the father is. Under 750 ILCS 46/301 and 302, both the birth parent and the person establishing parentage sign a form under penalty of perjury, in front of a witness. They then file it with the Illinois Department of Healthcare and Family Services.
Don’t treat this as a formality. A valid VAP is the legal equivalent of a court judgment of parentage. It gives all the rights and duties of a parent, and it can even support a child support order with no further proceedings (750 ILCS 46/305). Because it carries that weight, it’s hard to undo. You can only challenge it on fraud, duress, or a material mistake of fact. And after two years, you generally can’t challenge it at all (750 ILCS 46/302). Sign it knowing what it means.
A court order (adjudication of parentage)
When paternity is disputed — either parent denies it, or one won’t cooperate — you establish parentage by filing a petition and letting a judge decide. The birth parent, the alleged father, or the state’s child-support agency can all bring the case (750 ILCS 46/602). In contested cases, genetic testing is typically part of the process. The court can enter a judgment by default if the alleged father is served but doesn’t show up (750 ILCS 46/802).
Once the court adjudicates parentage, it applies the same best-interests standards from Illinois divorce law to sort out responsibilities and parenting time. So the parentage case and the parenting-time case often move together.
Does the mother automatically get custody if we’re not married?
No — not as a permanent rule. The mother holds parental responsibilities by default only until parentage and an allocation are established. Once you establish parentage, you stand on equal legal footing.
This is where two different things get tangled together, and untangling them is the point. The temporary default is real: with no order in place, the law presumes responsibilities belong to the mother (750 ILCS 46/802(c)). But the permanent maternal advantage people fear is a myth. Once parentage is established, the court presumes both parents fit and gives neither a preference for being the mother or the father (750 ILCS 5/602.7).
The default is a placeholder, not a verdict. The way you replace the placeholder with your actual rights is to establish parentage and get an allocation entered. Worth knowing: that same default provision has an exception. It doesn’t apply if the child has lived primarily with the other parent for at least six months before the mother tries to enforce it (750 ILCS 46/802(c)). That matters for fathers who are the day-to-day caregiver.
What should I do first to protect my time with my child?
Establish parentage now, and don’t wait to do it — that single step is what turns the default against you into rights a court will enforce. Three concrete steps:
- Establish parentage now. Sign a Voluntary Acknowledgment if the other parent agrees, or file a petition to adjudicate parentage if they don’t. Nothing else you want is available until this is done.
- Don’t wait. Until parentage is established, the law presumes the mother holds parental responsibilities by default (750 ILCS 46/802(c)). Establishing parentage is what replaces that default with your own enforceable rights.
- If you’re the everyday caregiver, know the exception. That default doesn’t apply where the child has lived primarily with you for at least six months before the other parent tries to enforce it (750 ILCS 46/802(c)).
Do this yourself when things are amicable. Bring in a lawyer when they’re not. Specifically, get one if the other parent is contesting paternity, cutting off your access to the child, or signaling a move that would pull the child away from you. In those situations, going it alone is how involved parents lose ground they can’t easily win back.
That’s where our firm comes in. Lafata Law is a DuPage County divorce and family law practice, and contested cases are where experience matters. Megan Lafata and Tom Elsner are both former DuPage County prosecutors who each tried more than 100 cases to verdict — so when a parentage dispute turns into a contested evidentiary hearing, you have attorneys who are genuinely comfortable proving a case in front of a judge, not just papering a file. If you’re trying to establish your rights or protect the time you already have with your child, reach out through lafatalaw.com to talk through where you stand.
This article is general legal information, not legal advice, and reading it does not create an attorney-client relationship. Illinois law changes and every family’s facts are different; consult a licensed Illinois attorney about your specific situation.