Fire Emblem Genealogy is actually really anti-incest as long as you ignore Shannan/Larcei, Lester/Patty, Nanna/Ares, Silvia/Claud, Lana/Febail, Ayra/Chulainn, Lachesis/Eldigan(According to Nanna), Lex's daugther/Iuchar, Lex's daugther/Iucharba...