Sorry to hear that happened to Chewy. As long as, this sort of thing doesn't continue to happen, he should be fine with some extra-loving from nice males, like your oldest brother. My Addie was abused and neglected until I adopted her at 3.5 months. She's a little weary of new people that come to "her" house, but is otherwise okay. A one time incident, should not be emotionally scaring for Chewy.

By the way, I'm glad to hear your mom wasn't standing for that crap!