If it was coded and implemented as it was envisioned then your body parts determine the overall attributes or parts of your offspring. If you were bipedal they'd be bipedal. If you had wings they'd have wings. If you were bipedal and had wings then they'd just be the winged type since both are bipedal. If you were a taur or some other multi-legged thing then they should also be multi-legged to a degree close to a scorpion or a spider. I'm not sure how they prioritized the two attributes if you were a taur or other multi-legged and had wings as well but I'd think the taur takes over due to it being more common than the winged variety.I have a question about the attributes of the large worm offspring in the nursery. I have a human character with a set of wings but none of the children so far were born with wings. Is it decided by the characters race what attributes the children receive?
Perhaps your issue is that they coded a rarity thing in and even if you had wings your child would be much more likely to be just bipedal than be a winged.