Step son rant!

My step son does nothing but play video games from 6am -8 pm . his diet consists of frozen eggos and icecream because EVERYTHING makes him cry. he crys because hes thirsty ,he cries because hes too full ,he has to burp ,he wants to finish his food hes just a big cry baby. hes 7! doesnt know how to wipe his own ass, dress himself or brush his own teeth. my son is 3 and knows how to bath himself, sleeps on his own , learning to write letters , knows how to put his shoes on helps make a variety of healthy foods and eats it. all of which my step son crys if i try to make him do on his own.like does his mother not see a problem with him!? his father continually treats him like an infant and doesnt see the problem with my son being so much more advanced than him. hes so bad its gotten to the point where i will take my son and leave the days hes at my house. he does nothing but hit and abuse my son and his father says nothing about it because HE starts crying hysterically