Your father's frustration with your homework may just mean that he is HG. My daughter and niece (both hg) would not make good instructors and get so frustrated. This is probably not much against you.

I do agree that he is giving a compliment that you work with your son. It probably is his way of being proud.

I deal with my husband's high functioning Asperger's and your father is not likely to even think too much about other people. That is no reflection on you - that is just the way it is.