Understanding Paternity and Parentage Laws in Kane County

 Posted on April 02, 2026 in Paternity

According to data from the CDC, 40 percent of children in the U.S. are born to unmarried mothers. In Illinois, a parent’s marital status can affect parentage and paternity issues. Whether you are a mother or father, or you soon will be, it is important to understand how Illinois paternity laws may influence your situation. Child support, child custody, and several other important matters hinge upon parentage.

At Goostree Law Group, our St. Charles, IL paternity attorneys have decades of legal experience in family law. We represent mothers and fathers in disputes over parentage, clarifying their rights and advocating for them in court. 

Is Paternity Automatically Established at Birth in Illinois?

Most parentage issues are paternity issues affecting fathers. Because the mother gives birth to the child, she is automatically the child’s legal parent. If the mother is married or was married at the time of conception, her husband is considered the father.

Illinois law also allows a presumption of paternity to arise from relationships legally similar to marriage, including a civil union or another substantially similar legal relationship. That presumption does not automatically disappear the moment the relationship ends. If the marriage or similar relationship ended, paternity may still be presumed if the child was born within 300 days after the breakup, divorce, invalidation, death, or legal separation (750 ILCS 46/).

Do I Need to Sign a Voluntary Acknowledgment of Paternity in Illinois?

For many unmarried parents, paternity may need to be established manually. A Voluntary Acknowledgement of Paternity (VAP) is a document used to confirm the identity of a child’s father. A father should only sign a VAP if he is sure that he is actually the child’s biological parent. 

If there is doubt about who the child’s father is, the child and presumed father may need to undergo DNA testing to confirm their biological relationship. You should know that there is no hard deadline to sign a VAP in Illinois. However, once you sign a VAP, you only have 60 days to rescind it.

There is also a Voluntary Denial of Paternity (VDP) document used to deny the paternity of a child. For example, if a married woman had an affair, her husband may be the presumed father by law – even if another man is the child’s true biological father. The husband may use a VDP form to deny parentage. Alternatively, he may deny paternity through the court.

How Do You Establish Paternity Through the Kane County Courts?

Parents may also go through the court system to establish paternity. Either parent may file a paternity suit to establish the legal father-child relationship. The person who files the paternity suit, or petitioner, will have the burden of proof in a paternity case. 

If paternity is disputed, the court may hold a hearing and review evidence from both sides. That may include testimony, records, and DNA test results. In many cases, the court will order genetic testing if a party asks for it.

If one party refuses court-ordered testing, that refusal can hurt his or her position. The court may hold that person in contempt, and it may even decide the parentage issue against the person who refused to comply. After reviewing the evidence, the court will enter an order deciding whether a legal parent-child relationship exists.

Five Reasons To Establish Legal Parentage in 2026

The most obvious reason to establish parentage is to be legally recognized as your child’s parent. However, there are more rights that come with proven paternity.

Rights to Child Support

A child has the right to financial support from both parents. If parentage is not legally established, it may be harder to get a child support order in place. A court cannot simply assume someone should pay support without a legal basis. 

Once parentage is established, the court can decide how much support should be paid. That money can help cover food, housing, clothes, school needs, and other daily expenses. This protection matters whether the parents were married or not.

Rights to Ask for Child Custody

Legal parentage also affects a parent’s right to ask for custody or parenting time. In Illinois, a person usually needs to be recognized as a legal parent before asking the court for parental responsibilities or a parenting schedule. This is mostly relevant to fathers, but it can come up in other situations. 

Establishing parentage gives a parent the ability to ask the court for time with the child and a voice in major decisions about the child’s life. However, it does not guarantee an equal split of parenting time or decision-making responsibility.

Insurance Benefits

A child may be able to get health insurance through a parent’s job or health plan. That can make a big difference for doctor visits, medicine, therapy, dental care, and emergency treatment. In some cases, legal parentage may also help a child qualify for other benefits. These can include Social Security or veteran benefits. Without legal parentage, getting access to those benefits may be harder or impossible.

Access to Family Medical Details

A legal parent-child relationship can provide important context to medical professionals. Doctors often ask about health problems that run in the family. These may include heart disease, diabetes, certain cancers, or inherited conditions. That knowledge can help parents and doctors make better choices for the child’s care.

Inheritance Rights for the Child

Legal parentage can also protect a child’s inheritance rights. If a parent dies without a will, a child may need legal proof of the parent-child relationship to inherit from that parent. Establishing paternity can reduce confusion and prevent disputes later. 

Contact Our St. Charles, IL Paternity Lawyers

The Kane County, IL family law attorneys at Goostree Law Group represent both mothers and fathers in a wide range of paternity actions. We are ready to represent you in a contested case and advocate for you in a trial if necessary. Call our firm at 630-584-4800 to arrange a free initial consultation today.