My parents are always fighting about my brothers Asperger's Syndrome?

My younger brother has Asperger's Syndrome and my parents are always arguing about it. The other day they had a huge fight about it and they haven't talked in almost three days. She never allows my dad to have a say in my brother and he is never able to state his opinion without her taking in negatively and getting angry at him. My mom is very worried about the now but my dad is worried about my brother's future. He's 13 and my mom has completely coddled him. My little brother is overweight yet my mom is completely against him working out despite all the doctors recommendations for him to start getting some exercise. My dad has been trying to get her to see it's the best thing but she always gets so angry whenever he suggests it. His psychologist even said it will help his anxiety yet my mom will not allow it because she feels it will even out as he gets taller. My moms best attack though is that my dad is not educated in Asperger's like her and he's never read any books on it but he works almost the entire week and she is a stay at home mom. It just drives me crazy and I can't stand their fighting anymore. Is there anything I can do to help them get along better and help my mom at least be open to my dads opinions and listen to him instead of attack? During their last fight I tried to state my thoughts that were the same as my dads but she just took it as my dad and I were ganging up on her.