Yeah, but if you're going to do it that way, then why even bother? That is, imo, worse than just having her be faceless/nonexistent.
Like, bugpony mom would be significantly different from doggo mom would be significantly different from catte mom would be significantly-- you get the point. The reason being is that all of the starting races have pretty significantly fleshed-out lore. If catte mom was really a full-blood kaithrit woman, wouldn't she be pretty dommy? She'd be tall and fit and probably a bit bossier than doggo mom would be. And she'd have nowhere near the huge butt that bugpony mom would have. Also there's two starting races that are herms, which complicates things even more because her sex scenes (because what's even the point of writing her otherwise?) would have to account for all that variance.
If we're just looking for a lip service scene mentioning that your mom exists, I'm sure something could be thrown together just for shits, but it'd be a really low priority at best.