Is there anyone whose one parent is abusive and other one is caring but too coward to do something?

My mother is abusive but father is caring, but i don't know for what reason he's too afraid of her maybe because of his poor background and his life filled with horrendous struggle and betrayal that he just don't have the human left in him anymore(his brothers kicked him out of the family as he was gifted with intelligence so due to that they were jealous of him and they didn't let him live in their houses and made him an outcaste , he used to sleep on footpaths and pavements as he has no home), my mom set me up for failure but he let it happen because he was too afraid of her but still he supported me in every way possible and cared about me. wished my father could've divorced my mother