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Alastor was young when it started it wasn't bad at first but then it got worse his father abused his mother until finally having enough of her he ended her life. Alastor was very traumatized after theses events leaving him mentally unstable. (I don't know much of Alastor's past besides the fact he was a serial killer and he may or may not have been a cannibal so I'm going off hunches or the very little I do know)