Dad: INFP (with strong Ti and Si)
Brother #1 (30): ISTP
Brother #2 (28): INFP (obviously unable to deal with his striking similarity with dad, so he's been working tirelessly on becoming a decent ISTJ for years - but despite any of his efforts, his still growing similarity with dad and me is too apparent to fool me)
Sister (26): ISFP
Me (21): INFP
= given that mom is not a strong J, our home has always been extremely unstructured, imaginative, and everyone has been given almost full freedom to act according to their hearts' desires (which has also had quite a few negative side-effects, but what hasn't).
Grandfather (paternal): ESxP
Grandmother (paternal): ESFJ
(= where the heck did this equal "dad"?! ><)
Uncle (paternal): ISTP (very, very wild guess)
Cousin (f) (paternal): INFJ
Grandparents from mum's side are both long dead, but mum says her father really reminded her of dad, so I would guess INFP too, INTP at the most. No idea about her mum.
As for my friends, the best one I've ever had was an INTP, but it ended up as a disaster. As of now my closest (or oldest) friends include several INFPs, INTJ, ISTJ, ENTP and ENTJ, but I guess I have friends of all personality types. My current flatmates are ENFP, ENFJ, ESFP and ESFJ (whose boundless openness sometimes makes me feel quite smothered actually).
My boyfriend is an ISTJ.