Twins in Africa.
Among some of the tribes in Africa if two babies come to a family at the same time they think it a dreadful thing. Nobody except the family can go into the hut where they were born, nor even use any of the things in it. The twins cannot play with other children, and the mother cannot talk to anyone outside of the family. This is kept up for six years. If the babies live to be six years old, the restrictions are removed, and they are treated like other children.