Quote from Loretta in Cleaning House
Loretta: Listen. I always wanted to be enough for you boys. I think that's why it always hurt whenever you asked about your dads, because I was always trying so hard to be both parents for you. But I was being selfish. You deserve the truth, so here it is. Sam is not your father. Barney: Are you sure? Loretta: Yes. He's black, dear.