Haha, when I told my mother that this guy had a history of being seriously abusive towards his brother, my mother was initially like "Brothers fight all the time!" She had 5 brothers and 4 sisters, big family. All of the males were wrestlers, so they would play pretty rough with each other. They lived in a big farmhouse on a massive farm.
I said "I'm sure my uncles beat each other up and fought frequently- but did they ever threaten each other with a fucking knife? Did they ever threaten to burn down grandma's farmhouse with you all in it?" Mother said "Oh... no, not that kind of fighting. This guy sounds like a real bad egg."
Brothers fight each other. Just like puppies or kittens or other mammals simulate fights with each other as play- this may help to prepare them for an actual fight at some point. So if a pair of brothers get into a shouting match and start wrestling around over some goofy teenage bullshit, that's absolutely normal. But it becomes something else if one of them grabs a fucking knife and says "I'LL GUT YOU LIKE A PIG". That's no longer play, that's a credible death threat. It's credible because he actually had the knife pressed to his brother, fucking insane. In a sane world, this lunatic would've been locked up in an asylum, as he is obviously a menace/danger to society.
Thanks to Kyle, the world is a little better now.
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