Hey, a "dotFAMILY" packaging of stuff would be fun!
If you gave each family member their own subsite then they could each theme their own set of pages with different skins, that would be interesting! Then of course giving them each their own photo alblum, blog etc would just be a matter of mounting the packages. For one small family, done easily enough through the admin package since new family members are fairly rare events in most families. But some auto-mounting would be easy enough to implement.
Without any auto-mounting features this should work write out of the box, if you were willing to set up subsites for family members by hand, and the right permissions ... gruesomely awkward given the current admin UI but doable.
Then you'd need to write the summary boxes for the main site index page ...
Coolest would be to make the whole thing portal/portlet driven but we're not quite there yet outside of dotLRN.
