I'm really confused about my dad and mental health?

Anonymous
Warning: this story is pretty disturbing.

So my father is a very abusive. He had been physically, verbally, and emotionally abuse to my mother and I for as long as my memory goes. Even as a baby. He couldn't comprehend why essentially a baby wouldn't listen to what he was saying. He would "punish me" for the smallest things that normal kids would do. Like crying, cracking my knuckles, tapping my foot, or disagreeing with him. When I say abusive, I don't mean spankings. I mean kicking, punching, head butting, upper cutting, and strangling.

But this isn't about me. It's about one of my pet guinea pigs I had as kid. My mother's an animal person so she gave them a lot of her time. As much time as most people would give a pet they love. I think he might have killed it.

One night my dad was trying to convince my mother to move country. A ridiculous move. She said that she first wanted me to finish the rest of the school year. He lost his shit and picked up a fold up chair to bash her with. She was holding my guinea pig and told him that if he did that he'd kill the animal. He started ranting about how she "loves the guinea pig more than him". She told me about it.

The next day my guinea pig was dead. My mum said when he woke up he immediately said that something was wrong with the pig. Then just casually walked into the kitchen. The way she was positioned looked like she was sleeping. He never paid them much attention anyway so it was odd that he said that. My dad started immediately deflecting. Saying that rats probably killed her. When I noticed the neck was snapped he said that she just ran into the side of the cage.

His personality is a mix of disorders. My old psychologist said that he sounded like a narcissist, a psychopath, and possibly schizophrenic.

For years my mother didn't believe he was "capable" of killing an animal so maliciously. However, after counselling she genuinely believes he killed our pet out of jealousy, control, and revenge.
I'm really confused about my dad and mental health?
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