Establishing Legal Parentage: What Illinois Parents Need to Know

July 28th, 2025 by Tiffany Hughes

Traditionally, establishing a parent-child relationship, or paternity, was necessary when the parents of a child were not married to each other. This is because Illinois law includes a presumption that married parents are the biological parents of a child born during their marriage. However, today there are many reasons why a particular person or persons may need to establish paternity or parentage in order to secure legal rights and responsibilities for their child.

The Illinois Marriage and Dissolution of Marriage Act (“IMDMA”) governs many family law issues, but the establishment of paternity and parentage is specifically governed by the Illinois Parentage Act of 2015. Understanding what paternity is, why establishing paternity is important, and how paternity is established are critical questions for many parents in Illinois.

What is Paternity and Parentage? 

Paternity refers specifically to the legal recognition of a man as the biological father of a child. Parentage is a broader term that encompasses the legal relationship between a child and their parents, including mothers, fathers, and sometimes other guardians. Establishing paternity is a key part of establishing parentage when the parents are unmarried.

Why Is Establishing Paternity Important?

Establishing paternity is crucial because it grants the father important legal rights, such as the right to seek child custody or parenting time, and establishes obligations like paying child support. Without establishing paternity, a father has no legal claim to parental rights or responsibilities, which affects the child’s well-being and access to benefits such as health insurance or inheritance rights.

How Is Paternity Established in Illinois?

Under the Illinois Parentage Act of 2015, paternity can be established in multiple ways, including:

• By Marriage: If the man was married to the woman who gave birth to the child during the marriage or within 300 days after the marriage ended, paternity is presumed.
• Voluntary Acknowledgment of Paternity Form (“VAP” Form): The Voluntary Acknowledgement of Paternity is a legal document signed voluntarily by the father acknowledging paternity. Signing the VAP form establishes the legal father-child relationship without a court hearing.
• Court Adjudication: Paternity can be established through a formal court proceeding, which may involve evidence such as DNA or paternity tests.
• Adoption: If a woman or a man adopts a child, he or she is legally recognized as the mother/father.
• Gestational Surrogacy: When a valid gestational surrogacy arrangement is used and complies with Illinois law, paternity is established accordingly.

What is the VAP Form and What Are Its Consequences?

As mentioned above, the VAP form is a key document that unmarried fathers can sign to legally establish paternity. Once signed, the father is responsible for child support and gains rights to seek child custody or parenting time. It is important to understand that signing the VAP form creates a binding legal obligation, including paying child support, regardless of any future changes in the relationship.

If I Sign the VAP Form, Am I Required to Pay Child Support?

Signing the VAP form legally establishes you as the child’s father, which includes the obligation to provide financial support. The Illinois Marriage and Dissolution of Marriage Act enforces child support obligations once paternity is established, ensuring that the child’s needs are met.

What if a Parent Changes Their Mind After the VAP Is Signed?

After signing the VAP form, either parent may challenge paternity, but the legal presumption remains unless overturned through a court order. This process typically involves paternity tests, which provide scientific evidence of biological parentage. The court will then decide whether to uphold or rescind the acknowledgment based on the evidence presented.

How Do Paternity and Parentage Affect Child Custody and Child Support?

Once paternity is established, the father has the legal right to seek child custody or parenting time and is obligated to pay child support. The IMDMA governs these issues to protect the best interests of the child. Establishing paternity is a prerequisite for enforcing child support and determining custody arrangements.

What Are Paternity Tests and When Are They Used?

Paternity tests are scientific analyses, often involving DNA testing, used to confirm biological parentage. They are typically ordered when there is a dispute about paternity or if a parent challenges a signed VAP form. Results from these tests play a critical role in court decisions regarding parentage, child custody, and child support.

Navigating the complexities of establishing paternity and parentage under Illinois law can be challenging, but understanding the significance of the VAP form, paternity tests, and your rights regarding child custody and child support is essential. Whether you are a custodial parent seeking to enforce child support obligations or a parent looking to establish legal parentage, the guidance of experienced family law attorneys can help protect your interests and ensure compliance with Illinois law.

 Need More Information or Representation?

If you are filing for a divorce or bankruptcy, need advice on how either proceedings affect each other, or need help protecting your assets when your spouse is filing for bankruptcy, give The Law Office of Tiffany M. Hughes, P.C. a call today at 773-893-0228 for a confidential, complimentary 30-minute phone consultation or email Tiffany Hughes directly at Tiffanyhughes@thugheslaw.com. Our entire practice is solely dedicated to the area of family law. We are highly experienced in providing legal representation for clients who need assistance with completing and understanding the VAP form, navigating paternity tests, clarifying what paternity and parentage mean under Illinois law, explaining why establishing paternity is important for both legal rights and child support obligations, guiding clients through the various ways paternity can be established, addressing concerns such as whether signing the VAP form requires payment of child support or what happens if a parent changes their mind after the VAP is signed, and supporting child custody arrangements while ensuring that child support issues are properly handled to protect your rights and the best interests of the child.

About Tiffany M. Hughes, Divorce Attorney, Principal, Managing Partner, The Law Office of Tiffany M. Hughes, P.C.:

Tiffany M. Hughes is a divorce attorney and Managing Partner of The Law office of Tiffany M. Hughes. Recognized as a Top 100 Lawyer in Lawyers Magazine in 2018 and 2019, Super Lawyer from 2016 to date, and in addition to numerous other accolades, Ms. Hughes represents individuals in all aspects of family and matrimonial law proceedings, including litigation, mediation, allocation of parental responsibility (formerly known as custody), parentage, divorce and other child-related matters.

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This blog is made available by The Law Office of Tiffany M. Hughes, P.C. for educational purposes only as well as to give you general information and a general understanding of Illinois law, not to provide specific legal advice. By using this website you understand that there is no attorney client relationship between you and The Law Office of Tiffany M. Hughes, P.C. The website should not be used as a substitute for competent legal advice from a licensed professional attorney in Illinois.  The law changes constantly and we do not go back in time to edit old posts that may be affected by these changes.  If you have any questions about Illinois law, which is the only State this blog and website discusses, please call The Law Office of Tiffany M. Hughes, P.C. for a complimentary phone consultation and do not draw any legal conclusions without speaking to a competent attorney in Illinois first.