What if the mother is married but the husband or registered domestic partner is not the father?

The mother must complete line 12 of the paternity acknowledgment. If she checks yes, she indicates that she was married or in a registered domestic partnership to someone other than the biological father at some time during the pregnancy. Both the mother and the biological father may sign the acknowledgment. The spouse or registered domestic partner must also complete and have notarized the Presumed Parent's Denial of Paternity (lines 38 - 44).