Life around an addict is truly crazy. As a mom, I know moms are the last ones to want to believe this could possibly be true about their child. It's even more difficult when young children are involved.
I don't have an answer for you. I don't even have one for myself...except that you can't fix it. If you're new to this, you may need to hear "You didn't cause it, you can't control it, and you can't cure it." I feel concern for the children surrounded by this though.
If you and your mother could find a naranon meeting or something similar, it would probably help. The first time I went to one, I went to find an answer on how to "fix" my son. Instead, I heard I couldn't fix him and all of their stories were so like mine...pawn shops, bounced checks, debt, shady places, etc.
Just read all you can, stay with this site, and take care of yourself. You will find people here who truly care and are supportive. We understand your frustration and your pain.
Pray there is relief for you and yours very soon.