I didnt think they actually bought the house, I thought I read somehwere they were only leasing it, and Im assuming here but if so it was probably just for the birth and recoop, like they did with Shilo, I do find it odd that they dont seem to want any American born children, I wonder what the reason is for that?
and for the 35 rooms....you gotta remember they have a whole entourage that goes everywhere with them, so there may only be 8 in the family but they have who knows how many bodyguards, nannies, cooks, teachers for kids etc. they gotta sleep somewhere too lol