Take back to Advance and tell them it needs to be replaced. It's under full replacement warranty.
Edit: make them prove to you it will not leave you stranded this winter.
set up a camera, let the cops deal with him. I would think the last thing you would want is to kill your brother, and if he is robbing your mother there is no telling what he would do if you confront him with a gun
FIFY
the weapons we all carry are defensive. If you attach anyone with anything, you should be thrilled if you don't die. Keep your D&&m hands to yourself.