Nikko,
You have gotten some very good advice from your friends here.
I don't know any of your story except what I read here, I don't need to though I lived it for way to many yrs.
Listen to the advice you have been given, you have nothing to prove to his dad and you will never convince him that there is 2 sides to every story, I don't know the situation with your DH and his father and this could be way off base but as a general rule your DH had to learn his behavior from some where and most likely it is dear ole dad, even if not his dad is not going to want to believe the worse about his son..

Good luck to you and take care of yourself..
Hugs, Linda