The baby is a few weeks old. The parents are not married, and they may or may not still be together. Then a question comes up that neither of them expected to ask: when it comes to custody, whose child is this, legally?

In South Carolina, the answer at the start is simple. Unless a court orders otherwise, an unmarried mother has sole custody of the child. A father can change that, but not by signing a form or putting his name on a birth certificate. He has to become the legal father first, and then he has to ask a court.

What the statute says

The rule is in § 63-17-20(B) of the South Carolina Code: "Unless the court orders otherwise, the custody of an illegitimate child is solely in the natural mother unless the mother has relinquished her rights to the child." The word "illegitimate" is the statute's, not ours. It is an old legal term, and it says nothing about the child.

The same subsection gives the father his path: "If paternity has been acknowledged or adjudicated, the father may petition the court for rights of visitation or custody in a proceeding before the court apart from an action to establish paternity." Read that sentence closely. It describes two separate steps.

Step one: becoming the legal father

Being the biological father and being the legal father are not the same thing. South Carolina law recognizes paternity in a few ways:

• A voluntary acknowledgment. This is a sworn, witnessed document, often signed at the hospital. Under § 63-17-50, it "creates a legal finding of paternity." Either signer can rescind it within 60 days, or sooner if a court or administrative proceeding about the child begins first. After that, it can be challenged only for fraud, duress, or material mistake of fact.
• Genetic testing in a paternity case. Under § 63-17-60, a test showing a probability of paternity of 95 percent or higher creates a rebuttable presumption, meaning a starting assumption the other side can try to disprove.
• A court order. A paternity action can be brought by the child, the mother, a person caring for the child, an agency such as the Department of Social Services, or "a person who claims to be the father of a child" (§ 63-17-10(C)).

A birth certificate signed by both parents counts for something, but less than people assume. Under § 63-17-60, it creates only a rebuttable presumption of paternity. And it says nothing at all about custody.

If the mother was married to someone else when the child was conceived or born, the analysis can be different, and that situation needs individual advice.

Step two: paternity is not custody

This is the part that surprises fathers most. Establishing paternity does not, by itself, give a father custody or a visitation schedule. The statute says he "may petition the court" for those rights, in a proceeding "apart from" the paternity case. Until a court rules, the mother's sole custody under § 63-17-20(B) stands.

Paternity carries obligations as well as rights. A legal father can be ordered to pay child support, and that obligation does not wait for a custody or visitation order to be in place.

How the court decides once someone asks

When a father asks for custody or visitation, the question is no longer who had the child first. Under § 63-15-230, the court "shall make the final custody determination in the best interest of the child based upon the evidence presented," and it "may award joint custody to both parents or sole custody to either parent." Whether the parents were married is not the test.

The court can also set parenting time on its own terms. The same section allows it to "allocate parenting time in the best interest of the child," whoever has custody. The best-interest analysis draws on § 63-15-240(B), which lists 17 factors the court may consider, including "the preferences of each child." We walked through them in the best-interest factors, explained.

If you are the mother

The custody the statute gives you is real, and it is yours until a court says otherwise. But it is a starting point, not a final answer. A father who has established paternity can ask the court to change it, and the court will decide based on your child's interests, not on the default.

An informal arrangement that runs on goodwill can stop working overnight. An order, even one the two of you agree on, gives both parents and the child something to rely on.

What this means for you

For a father, the order of operations matters. Settle paternity first, through an acknowledgment or a court finding. Then ask the court for custody or visitation. A name on a birth certificate and an informal schedule are not substitutes for either step.

For both parents, the strongest arrangement is one that is written down and signed by a judge, ideally one you worked out together. Once an order exists, changing it is a different question with its own standard. We covered that in can you change a custody order in South Carolina.

Stevens Family Law, LLC is devoted exclusively to family law, and our attorneys handle custody and paternity matters in Family Courts across South Carolina. For unmarried parents, the most important work often happens before anyone sets foot in a courtroom: settling paternity, then putting the parenting arrangement in writing. Call our office at (864) 598-9172 or request a consultation.

This article is general information, not legal advice, and reading it does not create an attorney-client relationship. Custody and paternity questions are highly fact-specific, and outcomes vary from case to case.