I give the kids last names... first 2 letters of each parents name... then I dont let anyone mate with anyone who has any similarity in the first or last name. ie Ema 's father is Kayak and her mother is Banga.. last name is KaBa. Ema isn't allowed to mate with anyone who's name begins Ka or has Ka or Ba in their last name. No mating with your parents or siblings that way. Cousins is another thing tho lol