Sure, but she’s also his mother, not a random family member. I’m not going to fault a mother for standing by their child, no matter what he did.
She didn’t let him buy anything, but she couldn’t make him get rid of it because it wasn’t in her house. It was locked up at a friend’s house in a different town.
She was also ill, poor, dyslexic, and a single parent dealing with a difficult child. She doesn’t seem to have much in her life but her children, I’m not going to condemn her for not banishing him from her life. It’s not an easy thing for a mother to do.