i don't know exactly where you are going with the second question, but my mom is much more accepting then my dad. My dad is very in denial about it, and changes the subject whenever i mention something about it, but my mom uses the correct name almost all the time now, and uses the right pronouns about 80 % of the time now. she also tries her best to understand and support me, and she lets me talk to her about this kind of stuff. she even goes to 'lauras playground' to learn more about transsexual people.
if my mom is just an exception, and you are right. well its probably because (generally) every dad wants a son, and every mother wants a daughter. These mothers expected their 'daughters' to grow up, be blushing brides, have kids, be feminine and beautiful, so when their 'daughters' try to transition those hopes are smashed. also, these mothers are (generally) cisgendered women, they dont understand why someone would want to be a man when they could be a woman, because they are so happy in their gender. thats why it seems women are less accepting of trans men, then men are, tell a guy you are an FTM, he can at least understand why it you would 'want to be a guy'