I'm sorry to hear that you have a bad relationship with your mother, but maybe it's time to discover a good mother figure. All mothers are not the same, and as the comment below said, you are free not to get along with her during the game (this is one of the positive points of this game ^^). Also, I believe that later we will have the choice to consider a character as our father (a bit like in OL1^^). Finally, the choice to be intersex at the beginning of the game, I think it's in the biological sense. There really are people who are born with both sexes.