I have 4 neutered indoor cats. In the past 6-months my 5 year old…

I have 4 neutered indoor cats. In the past 6-months my 5 year old has been being very mean to my 2 1/2 yr old. He chases him, jumps on his back with claws sticking in his sides. He screams and they fight, what could be the cause of this?

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