My Step Son

I worry about my step son. I just listened to the VIP call where Brooke coached someone about her daughter so I know it doesn’t help to focus on his behavior but my thoughts about it. I want him to plan for the future and figure out what he is going to do with his life. I don’t want him living under my roof forever and I don’t see any end to it. My thoughts are he is unmotivated, lazy and never going to make anything of his life. I know theses thoughts are not serving me and the result is a bad relationship with both him and his mom (in this situation). I don’t want this and I having been working on thoughts like “it is his life and he can do what he wants with it”; “he is working now so I know he has what it takes”; “he just needs my love and understanding”… but then I know his job ends in September and he plans to live off the money he has made until it runs out. My thought is he will never be self-sufficient. I can’t kick him out because his mom won’t let me. We charge him minimal rent and provide everything for him, so why would he ever want to move out?
I appreciate your thoughts on this.