I think we're adapted to distrust other "clans" and be altruistic toward our in-group kin. Genes for with the right balance of self-interest and concern for our kin (related genes) were fruitful and multiplied. This does not mean putting others' interest ahead of our own is a virtue. I think we have to put what we think is right for us first. If we naturally desire to give something to someone, say to give our kids some advantage at our own expense, we should do what we think is right, use reason, and not second-guess our true desires just because of their origin. In other words, maybe I know selective pressures adapted me to want things for my kids more than for me. The fact that evolutionary adaptations made me this way does not depreciate what I truly want.

What would be wrong IMHO would be telling my kids, or anyone, I made a lot of sacrifices for you. I was just doing what I wanted. Unless you willingly made a contract or agreement with me of some sorts, no one is in my debt, and I'm not in their debt.