Hmm, now that I've seen my families lined up, I noticed that both my rainbow haired girls (families 2 and 5) had blonde kids (except for Chaka who was adopted). Their grandchildren, however, were the purple haired girl, the green haired boy and the really red haired boy (in both families). I think they're continuing their grandma's legacy of having bright colored hair. Their haircolors combined match that of their grandma's.