Me: INTP
Sister: INTP
Mom: Tested as an INTP, but due to her role as family "organizer", she acts often as an ESTJ because she is constantly required to manage my "head-in-the-clouds" sister and my father, and myself, and, being an INTP, is not happy about it. She is less introverted than myself, and is conserned for my social "well-being", so constantly nags me about "making more friends", and therefore, to me, comes off as being Extroverted.
Dad: INTJ, although he's not organized at all, so may be close to an INTP.
My grandpa on my Mother's side is an INTP or INTJ, my grandma is too hard to type, again, because she may be an INTP, but because of the "organizer" role she has to play, represses her own type.
My grandpa on my father's side was extreamly reserved and quiet, so, again, is hard to type. But is probably an INTP.
My grandma on my father's side has become mentally deranged, so it is impossible to type what she really was. However, what she has become is definatly everything an INTP hates.
My family on my mother's side has a few family legends that go back to Scotland, Ireland, England, and Norway...the characters portrayed in those stories often types act in an INTP like manner.