I am so sorry to hear about the way your mom was treated by your dad...My sister and I were once in a situation like yours with my parents to..My dad would yell at my mom, say STUPID things in front of people and get really mad and walk away sometimes and my mom would just sit there and take it..GRRR Would make me and my sister SO angry! Then my dad got kidney cancer and he realized how poorly he was treating my mom and how much he really needed her by his side..Since then I have NOT heard him raise his voice once to her...Not saying your dad needs to get sick to realize what is going on, but one day he will realize it..Hopefull sooner rather than later
Best wishes to you and them! And we are hear for you to vent all you want!!
XoXoXo
Fran