I have declared three blogs to be parental, largely because I do recall following Defective Yeti and All I Need Is Everything on a regular basis before I ever heard of LiveJournal and because lambertman gave me an access code. Therefore I have two daddies and one mommy. Leave it.
From here, it turns out that I have one snarky half-brother, Rich Toscano (who happens to be extremely entertaining) and one smokin' half-sister, cookiebird of Xanga. Perhaps these should only be one-third-brother and one-third-sister as I have two unmatched parents? Not sure.
Anyway, a nice idea and I look forward to finding out who my sixth cousin twice removed is. (If it turns out to be myself, I shall be confused.) Not as well-integrated as Friends lists, but lots of fun all the same. I encourage you to help chart your own part of the genealogy of the blogosphere.