I don't outright recall anything saying much about it to be honest. I know there was a lot of talk about what the society would be like, and there were points raised to both the abusive side and to the protective/loving side as well.

With Keeper groups being more family based as opposed to tribe based I would think there would be a lot of variation and it all depends on what the matriarch of each family unit would be like.

From what I've read the units tend to be from immediate family to extended family but not beyond. Blood relations, primarily.