Can my brother get custody of my nephew ?

Long story short my brother and his ex had my nephew at a young age and my brother wasn’t really in his life till he was 3 and now he is 5. His ex has had to other kids with different men and lives in some nasty apartments with other people with no car and my brother finally got a good stable job and has his own... show more Long story short my brother and his ex had my nephew at a young age and my brother wasn’t really in his life till he was 3 and now he is 5. His ex has had to other kids with different men and lives in some nasty apartments with other people with no car and my brother finally got a good stable job and has his own place and everything needed for his son. I just want to know what will the judge look for in this case and if there’s any chance he can get his son back because his mom doesn’t really want him to live with his dad
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