House of the Fat Chocobo!

I had some other stipulation that you may need to add - oh right. Can only one or two members belong to the oldest generation? Say Persons A and B are brothers, and A founds the family. B still belongs to the oldest generation, but is A still the family head? What if A marries away? Does B inherit the house then? I would imagine so.

Are we also assuming a patriarchal society? IE women marry into the man's family? Or is that decided on an individual basis as well?