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Establishing Paternity

The legal step that makes a man a child's father in law - and signing the hospital form is one of two routes, not a formality.

Informational only - this is not legal advice. These definitions explain general legal vocabulary in plain English. They are not advice about your situation, reading them creates no attorney-client relationship, and the law differs from state to state and changes over time. For advice you can rely on, speak to a lawyer licensed in your state.

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What it means

Establishing paternity is the legal recognition of a man as a child's father. Where the parents are married, most states presume the husband is the father of a child born during the marriage. Where they are not, the law generally recognizes no father until paternity is established, and until it is, the father has no parental rights and the child may have no claim to support, inheritance, or benefits derived from him.

There are two ordinary routes. The first is a voluntary acknowledgment of paternity, a form both parents sign, often at the hospital after birth. Every state must offer this, and once it takes effect it has the force of a judgment - which is the part most often misunderstood at the moment of signing. The second is a court order, following an action brought by either parent, by the child's representative, or by the state child support agency, and typically supported by genetic testing.

An acknowledgment may be canceled within a short period after signing, and after that period it can generally be challenged only on limited grounds such as fraud, duress or a material mistake of fact. Both the cancellation period and the grounds are set by state law and neither is stated here. The practical consequence is worth stating plainly: signing is not a preliminary step to be corrected later, and a man who is unsure whether he is the biological father is asking a question that is far easier to resolve before he signs than after.

Establishing paternity is also what makes the rest of family law available. Custody, parenting time and child support all follow from it, and so do a child's rights to inherit, to be covered by a parent's health insurance, and to claim Social Security or veterans' benefits through him. Establishing paternity and obtaining custody are separate steps, and the first does not accomplish the second.

Where this comes from

Paternity is state law, but the framework is shaped by federal conditions on child support funding: 42 U.S.C. § 666(a)(5) requires every state to offer a simple civil process for voluntarily acknowledging paternity, to give a properly executed acknowledgment the force of a judicial determination, and to provide a period during which a signatory may rescind it, after which it may be challenged only on the grounds of fraud, duress or material mistake of fact. Many states have adopted some version of the Uniform Parentage Act, whose 2017 revision addresses assisted reproduction and de facto parentage; states differ on whether and how the marital presumption may be rebutted, on the treatment of same-sex parents and non-biological parents, and on parentage in surrogacy. Any rescission period or limitation period for a paternity action is fixed by state statute and none is stated here.

When people hire a lawyer for this

The single moment where advice is worth most is before signing an acknowledgment while in any doubt, because the form is a judgment and not an intention. Advice is also worth taking where a genetic test has come back unexpected; where a child was born during a marriage but to a different father, since the marital presumption must be rebutted and states set real limits on that; where a father is being denied contact after acknowledging paternity, as rights follow establishment but are not self-executing; where a mother wishes to establish paternity and the father is absent, uncooperative or in another state; and in any case involving assisted reproduction, surrogacy or same-sex parents, where the answer depends heavily on which state's law applies and on whether a court order rather than a birth certificate has been obtained.

Worried about the cost? A lawyer can be hired for one part of a case only (limited-scope representation), may be paid from what a claim recovers (contingency fee), or may be free through a pro bono program or legal aid; a court can also waive its own filing fees.

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Related terms

Other entries in the same area of law, each written from the same primary sources.

AdoptionThe court order that makes a child legally the son or daughter of someone other than the birth parents - the kinds of adoption, whose consent is required, how the birth parents' rights end, the home study and the hearing, and what the order changes about inheritance, records and the child's name.
Annulment (Void and Voidable Marriage)A court judgment declaring that a marriage was never valid, as distinct from a divorce that ends a valid one - the difference between a void and a voidable marriage, the grounds each state recognizes, who may bring the case, and what an annulment does to property, support and children.
Child SupportMoney one parent pays the other toward a child's living costs, set in most cases by a state formula rather than by negotiation.
Common-Law MarriageA marriage formed without a license or ceremony by living together as spouses and holding yourselves out as married - which states still allow it, what has to be proved, why every state recognizes one validly formed elsewhere, and what it means for property, support and inheritance when the relationship ends.
Dividing Retirement Accounts in Divorce (QDRO)How pensions, 401(k) plans and IRAs are divided at divorce without tax or penalty - what a qualified domestic relations order is and why a divorce decree alone is not enough, the difference between a defined-benefit and a defined-contribution split, the plans that need a different order, and the mistakes that cost a former spouse the share the decree awarded.
Grandparent and Third-Party VisitationWhen a court can order that a child spend time with a grandparent, step-parent or other non-parent over a parent's objection - the constitutional limit set by the Supreme Court, the circumstances in which state statutes allow a petition, the special weight a fit parent's decision receives, and what a petitioner must prove.
Grounds for DivorceThe legal basis a divorce is granted on - and in every state today at least one basis requires proving no wrongdoing by anyone.
Guardian ad Litem and Custody EvaluatorThe two neutrals a court most often appoints in a contested custody case - what a guardian ad litem does and does not do, how it differs from a child's attorney and from a custody evaluator, who pays, what they may see, and how their reports are used at trial.
Guardianship of a MinorA court order giving an adult who is not the parent legal authority over a child's care, or over the child's property, without ending the parents' rights - how it differs from custody and adoption, who can be appointed, what the parents keep, and how it ends.
Legal and Physical CustodyTwo different things the word "custody" covers: who makes major decisions for a child, and where the child lives.
Legal SeparationA court status in which spouses live apart with binding orders on support, property and children, while remaining married.
Marital Property DivisionHow a court splits what a couple owns - and "equitable" means fair in that state's judgment, which is not the same as half.
Modifying a Custody or Support OrderChanging an existing family court order - which usually requires proving something has changed, and never happens by the parents' agreement alone.
Parenting Plan and VisitationThe written schedule and decision-making rules for a child after separation - and the document courts increasingly require rather than invite.
Prenuptial AgreementA contract made before marriage about property and support - enforceable in every state, and set aside more often than most people expect.
Protective Order (Restraining Order)A court order telling one person to stop contacting or coming near another - enforceable by police, and valid across state lines.
Relocating With a ChildMoving a child away from the other parent - the family law dispute most likely to require the court's permission before the move, not after.
Spousal Support (Alimony)Payments from one former spouse to the other - discretionary in most states, and taxed differently for instruments made after 2018.
Termination of Parental RightsThe court order that permanently ends the legal relationship between a parent and child - the grounds a state must prove, the heightened standard of proof and right to counsel, the difference between voluntary relinquishment and an involuntary petition, and what the order does and does not end.

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Part of the LawyerLand plain-English legal glossary. Definitions are written from primary sources - statutes and court rules - and each entry states the authority it rests on, or says plainly when the doctrine is state law with no national rule.

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