What do I do if I feel like I should protect my mother from my father?
That depends. Why do you have to protect your mother from your father?
She says he was abusive when my parents were younger.
If you think your dad doesn't treat your mom right, you definitely should stand by her. It's your duty as her son.
Thanks for the tip. Wish I had done something about it sooner.
Well it is not to late to want to protect your mom. It will make you a good son to do so.