My nephew the brony

I've got a 23yr old step son that won't hit a lick, sleeps all day, sits up all night playing video games. Screams into a headset at other people cussing them at all hours.
I kicked him the hell out of the house, thought his mother was going with him. Apparently I was the only one who had a problem with this. He lives with his grandmother now. My brother in law says his mom has a new dog. All he does is eats, sleeps and ***** in the house and nothing else.
Your brother better nip this in the bud, quick!