MADISON, Wis. (AP) -- A same-sex couple who sued for the right to marry in Wisconsin wants a federal judge to mandate that both gay parents' names appear on their children's birth certificates.

Karina Willes and Kami Young were among a group of same-sex couples who convinced U.S. District Judge Barbara Crabb to legalize gay marriage last year. They filed a motion with Crabb on Monday asking her to order records officials to place both gay parents' names on their children's birth certificates.

They say they've tried unsuccessfully to persuade the state's Vital Records Office to amend their daughter's birth certificate to include both their names and Crabb needs to clarify that the presumption of parenthood applies to both heterosexual and homosexual married couples.

A state Justice Department spokeswoman had no immediate comment.