Infedelity

My father had an affair that lasted many yrs. He fathered a child by the other woman. I had just hit 7th grade when I found out. I'm the one who told my mother. My father knew I told and focused his anger on me. I eventually went into State Foster Care for abuse to get away from him. My father never paid a dime of support for his other child. He never fostered any relationship with his son. I never lived back at home since 7th grade. I never received any kind of support from my parents. My mother stayed married to my father. My father a very mean and manipulative man. He's in his 80's now. He is deliberately cruel to everyone he meets. I maybe only see my parents every 7-8 yrs for short amounts of time. I grew up , put myself through college and obtained a good job. I'm retired now. I know my father has made my mother's life a living hell for the last 60 yrs. But ultimately she is the one who chose to stay. The rest of my siblings feel the same way I do about him.