I think it’s like, The one who gave birth is mother regardless of gender, and the one who stick it in is the father, regardless of gender, it’s the secondary gender, alpha or beta or omega that really counts. And usually, it’s the omega getting dicked and giving birth so they are the mother, the alpha is usually the one doing the dicking so they are the father. Regardless of the first gender.
I agree I never got it either, except "they gave birth" ... well they're still male. In real life two gay dads are called "daddy/father" and 2 mothers "mom/mother"It's the same when they call the other "my wife" ... Hmm how about no ? He's a man so he's your husband !
Oh well yeah yeah it's fiction but still authors could try !

It's weird to me when they call males "mommy". He's a male in body and soul? It bugs me. I don't mean anything bad by writing this, not at all. I just don't get why they always have to make one person the "mommy" in an omegaverse. Is there something wrong with two dads? Even if a male omega gives birth to a child, that doesn't make them female? Am I wrong? I don't quite understand this yet.