So I have an issue my male cat (4 yrs) is attacking my dads obese elderly cat (18+ yrs). She’s never liked him not since he was a kitten but now she spends all day hiding under my dads bed. The second she try’s to run he acts like it’s a game and cases her down and rips her up until she pees herself all the while he struts around with his tail high. The biggest issue is the litter box is in my room opposite side of the house and my room is his “main territory” and my dad said he’d rather put all the cats down then set up another litter box and if I cant get him to stop attacking her and she starts peeing in his room she’ll be the one put down. I really need some help.