My dad acts childish and is hot tempered?

septemberbay
Im 18 and to give a bit of background info, my mom is the provider of the family, she works 24/7 and cleans house and basically does EVERYTHING. My dad is obese and has a job but its not steady because he's a financial advisor and probably goes to meetings once every month until he's working with a business. I asked him what was going on with his job (nicely) and he said he could be better but doesn't want to because working too hard "makes him sick." This really bothered me because my dad doesn't do anything to help out around the house. He sits and watches tv all day and whenever I point it out to him he gets super mad and smacks me on the back of the head or says things like "you have no respect" and yells and threw car keys at me once saying I could drive myself home. I told him I would treat him with respect when he started acting like an adult. He acts like a child and expects my mom to do everything for him. He pouts when he doesn't get what he wants, he always is shopping and buying stuff with my moms money, and is constantly eating and gets very angry when hungry. One time he got so mad at me, he stayed up all night throwing shoes at me and farting in my face and pouring water on my head to make me stay awake. I have tried many different approaches, I have told my mom and she notices it too but when she talks to him he just gets mad at her. I have tried being nice but he always ends up saying something rude. It may sound like Im exaggerating but Im not and Im tired of trying to get through to him. In fact, my mom wanted to go to couples therapy and he refused. It sickens me how selfish and self-serving he is. She even thought he had a psychiatric problem for a while but there was nothing wrong wth his brain scan. My dad even says that "he does everything around the house" which appalls both me and my mom. What can I do?
My dad acts childish and is hot tempered?
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