one more problem:
the black sheep/ white swan problem:
when family is all one type, and child is of different type. same problem with the island. people of same types tend to live near each other and socialize with each other, and don’t know how to find and where to look for those of other types. (if they even admit that their child is different from them – if not, that’s another problem. by the time they realize and/or reconcile themselves to the fact that their child is different, child is already older and problem is further complicated.