Do you have lesbian/gay couples with biological kids?

I have a main married gay couple, one of them got abducted and impregnated and now they have a daughter!

A bit unrelated but I have a question about the alien baby stuff, so this is the first time a sim of mine have gotten abducted and impregnated and I noticed that the other husband didn't have the role "Father/Dad/Stepdad" to the baby in the realationship menu. Is this a bug or is it supposed to be like that beacuse he isn't biogically realated to the baby? In the family tree it says he is her stepdad though.