Well I am curious what is supposed to happen when you go to a family's page. Is it just privacy through obfuscation? In that case you should disallow everything except non-family pages in robots.txt, and maybe make those url's a little longer.

Yeah, privacy of the main page is through obfuscation. We're thinking that families want the choice to email the Ramamia family page link to other members, so then they can add themselves.

However, public content pages such as albums, messages, etc. will only be available when a) logged in or b) similarly obfuscated public URL.