because it's her half brother, i can just fudge and say she got all her features from her mother? anyway, basically after her mom left when she was four (ish), her dad would have found himself another woman (or women) and he would've been the product of one of them. she grew up from there between her aunt and dad so he could have done the same or stayed primarily with his mom. i'm flexible on details there, how close they are, etc.