Quick answer
Legal parentage and local law matter. Do not assume every unmarried parent begins with the same enforceable rights in every jurisdiction.
Do now
Gather parentage acknowledgments, birth records, and any earlier proceedings. Ask how to establish parentage if needed and obtain a custody or parenting-time order. Describe the child’s present living arrangement accurately.
Watch for
Being named on a document or paying support may not answer all custody questions. If there is a dispute or threatened removal, get prompt local advice.
Official sources
NJ Courts — Initial FD application packet, NY Courts — Paternity, NY Courts — Order of Filiation, DC Courts — Parentage and Child Support Branch.