I want to live with my mom I'm 16. Because my dad and his wife are horrible to me and my two brothers I will admit I am not a perfect teenager I do let my grades drop and I sometimes do things I'm not suppost to but if it says anything I am in 11th grade and been to 5 different high schools they pull me out for the stupidest things and I just need to know how to set up the prosses to live with my mom advice ?

Your mom will hire an attorney and file in court asking that custody be given to her She will need to prove it is in your best interest.

A great deal of this will depend on why your mother does NOT have custody. That could be something she would have to overcome in order to get custody now.