Dad? Is that you?

I read this article last week and never had a chance to voice my opinion. Apparently, Dick Cheney's lesbian daughter is having a baby, which is a conundrum in and of itself. So anyway, as I read more about it, it seems that she was probably artificially inseminated. She has been with her parter for so many years, and I guess they will be the "parents" of the baby. My question is, which one does the kid call mom and which one does it call dad? Is whichever one who has the baby the mom by default? Or are they both mom? That's just f-ed up. I feel bad for the kid. My aunt was artificially inseminated, but she doesn't have a "partner". The kid seems halfway normal, but it has to be pretty weird.

Cheney baby story