Bad Mother Rant

My half-brother is my legal charge because his mother was neglegent and a horrible mother. We went to court to see if the current arrangement with me watching him was best for him and it was decreed he will stay with me. I am young, only 18 but I was the one who got him to stop smoking, drinking, and talked him out of doing drugs. His "mother" never did anything for him. He was living in horrid conditions and was malnurished. How could any "mother" call herself that when she treats their children like shit? You carried it, but you sure as hell did not raise it. I did. Thanks to me he has a scholorship and a retirement fund,already making investments, and has amazing health.
What's worse is she showed up to court drunk and afterwards tried to fight me. Some women just don't need to have children. Normally I don't judge parenting styles because you do you, but this... no. Just no.