In fact I wouldn't even begin to guess. I know them too well, too intimately.
All I will say is that ive been at odds with my brother since I was a baby. We both despised each other as children and fought constantly. Even now, when we appear to get along better, it is mainly only because I refrain from physically laying into him with rage.
I dont see why I should bother keeping harmony, the man is a cunt to me and always was.
Father - ENFP
Mother - ISFP
Brother - ENFJ maybe, just a guess
Grandma - ISFJ
Grandpa - INTJ maybe
Friends that made a test:
All the time I thought my mother is a ISTJ. She got it on a test and it seemed to fit, because she can be very orderly and strict sometimes. Maybe these habits are due to her education. Now she made a new test, got ISFP and said that this is exactly her. I have trust in her self-assessment.