Well written but not really horror... horrible, haunting, touching, but in a manner that most people, unfortunately, have to face in one way or another (not this exact scenario, but variations on this theme). Also, and I in no way want to diminish the suffering of real-life abuse victims, but I am tired of the fictional trope where the big reveal is child abuse. I feel that got all played out a decade or two ago.
I'm not saying that people shouldn't write about it but I'm bored of it being the 'twist'. It reminds me of the stories I wrote as a kid which always climaxed in the protagonist killing themselves. As I was listening to it, I was just thinking "Please, don't let his secret be that he's gay or he was abused... give me something new"... then Uncle Mick was mentioned and the game was up. This could have been a great opportunity to add a more horror-y twist .. like, Uncle Mick killed someone and the protagonist helped him chop up the body (e.g). So, good story, but didn't give me anything new.