Anon gets married

Wouldn't doubt it. The kids will grow up together and probably start dating or some shit.

Incest doesn't have to be blood related does it? I thought it was within a certain "radius" of relation, such as step-siblings and whatnot?

True, it's more of sexual relations between two people classified as too close to marry. But I suppose I personally would find this more taboo considering age differences rather than incest because there's been situations where the children of two single parents are dating and the parents end up dating everyone gets married and happy. The only difference is, due to the fact it's not a mixing of generations (parent dating child) you don't end up with the weird my dad's kid is my sister.