i'm a new XBox 360 owner. i've got a family of 6. do we all need Live memberships or do we all need just one to play under? why would each of us need one as i expect that's the answer i'll hear back. as a parent can i monitor their activity and/or put in parental controls? what links or sites can i review to understand where to get the most value for my family and our future live accounts? thanks!