Older brother: ISTJ
Younger brother: ExFP (N/S usually tests as close, though leans more towards ENFP)
Oldest Sister: ENFJ
Older Sister: INFx (consistently tests as INFJ but has quite a bit of Pness and sometimes tests INFP [high Fi/Ne] when only cognitive functions are concerned)
Father: INTP was likely for him, but with rather developed Fe and strong J tendencies. I'm not sure that I can describe him through MBTI... only that he was a tenderhearted, hard-working, giving, science (and science fiction), music, and people-loving person who made a lot of mistakes and had a lot of regrets. Personality, like mother, affected by an onslaught of mental illness (paranoid schizophrenia, bipolar, and Borderline PD) and persistent drug abuse.
Mother: ESFP, though her true personality is often clouded by her anxiety disorder and ever present, almost debilitating paranoia
Not sure about friends.