I'm not so sure that tracking peoples relationships on here is a good thing, whether it be family members or any other type of relationship. The next thing that someone is going to want to do is keep track of users who login with one screen name but from several IP addresses (are they cheating or simply logging in where it's convient?) Personally, I know I log in on at least 3 different IP's during the week.

That's not even touching on the whole privacy issue. My opinion is that this idea/request is one destined to go down in flames.