i've had some experience here and i can tell you that some sites do not even allow you both to log on at the same time.
in summary:
1. it greatly depends on the poker site
2. its best to contact their customer support first so that you will know the restrictions and avoid problems later on
3. it is not surprising to find that you will need to go through more stringent verification process
as for PokerStrategy.com, we have no problems with having 2 members from the same household.
we've had members here who are brothers, roommates or married. i think it's great
of course, everything needs to be properly verified first 
smiles,
wendy