What should I do if my dad is really cruel to animals?

He would go fishing, bring home fishes and put them into plastic bags, into the freezer until they die. If it's lobsters or crabs, he'd boil them alive. It really angers me but i've told him about it and he won't stop.
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He is nice person but is violent to things he considers food
What should I do if my dad is really cruel to animals?
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