My dad went so far as to get an account here at the Org, even though he doesn't watch animé, doesn't watch AMVs other than mine (as far as I know), has never made an AMV, and has no intention to start.
His last login was about a month ago, so I know he still checks up on me and my videos occasionally.
It's annoying as hell and I wish he'd stop it.
I have no idea what my mother thinks because she's never said anything to me about it.
My younger brother has had an Org account for longer than I have; he's a good loyal animé fan and AMV watcher, though he doesn't make any himself. Just last week he was bugging me about how to make a fire effect in After Effects, even though I've never touched the program in my life.
(I just checked his profile, and I must say I'm glad to see FLCL, NGE, and Kare Kano now holding the three top spots on his animé list.

)
I don't think my other two siblings (both younger) have yet seen enough to know or care, though they're both animé/manga fans as well; I came home for winter break to find that my 7-year-old brother had just gotten his first manga, the first volume of <i>Clamp School Detectives.</i>
Of the friends I met through CTY (summer nerd camp), many are into animé and AMVs, and I know at least two have Org accounts, and one of those two has videos listed here (both rather nice videos, IMHO).