My father's bipolor i'm quite sure

I remember growing up? My mom used to yell saying its my fault she had to stay with my dad. She had to kept a family as whole. There's nothing whole some about a man that swears at his family all the time. Grin's his teeth like he was a mix pitbull. Tell's us every single day that we're fat cows without him we are nothing. Bangs and breaks things. Being degrated like this? a lot of the times i think to myself " why wasn't I a product of an affair "? He'd abuse us physically and emotionally , then when hes done? he'd pretend he never said anything or done anything. I'm not sure if he pretended or he just is crazy enough not to notice he is a nuttcase. My younger sister thinks he's biopolar I think he's the worst excuse of a human being. My mom claims that being who we are? we have to suck it down so other's wont see our family's dirty laundry.....I think ppl would be more worried about the crazy _____ face then a bunch of emotionally battered ppl.