What do you think of me telling my mom she's not my mother?
Why would you tell your mom that she's not your mom?
She left my father in an underhanded way.
That must've hurt your dad when your mom left under nefarious circumstances. Sometimes it's best just to keep you distance. Could there have been extenuating circumstances?
No, she was being a boring house wife!
It's fine to be upset with your mother, but causing drama with her at this point isn't really worth it. Why waste your time on someone who you shouldn't have to? Live your life and let her live hers.