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Since nobody anwered yet, here's a few ideas that instantly came to my mind:

1. Make "your family" a transitive relation, similar to how it is in reality: If Y belongs to "family" of X, and Z belongs to "family" of Y, then Z also belongs to "family" of X

2. Let "family members" start your currently unused games without your permission and don't give you the possibility to cancel their gaming. Imagine you bought a new game just yesterday, you're coming home from school, excited to play the great new game - only to realize that some idiot you added to your "family" list took the chance to play your game and just doesn't react to your angry messages that he should instantly stop playing your games. If the guy was really from your family you'd simply call for mom and she'd resolve the issue...

3. Apply some special rules/options for members of the "your family" group that would in practice prevent most people from declaring strangers or even just friends as being "family".