Hi and Welcome to PT.

I don't have advice either but if you figure something out please let me know. I have three cats - Ripley 11, Jazz 1 1/2 and Scout around 1 1/2. We've had Ripley since he was a kitten. We added Jazz as a kitten last summer and I got Scout at around a year old this July. Jazz and Scout tolerate each other and play but it often turns a little violent and poor Scout gets the brunt of it. Jazz gets along with Ripley pretty well, not buddies but no fighting. Scout and Ripley are a different story. Ripley is afraid of Scout and all she has to do is look at him sometimes and he will run and of course she chases swatting his butt the whole time. She makes him miserable sometimes and I don't know what to do. He is almost four times her sizes but that doesn't seem to matter. I'm beginning to think this will just be life around here. I would love if they could coexist better so Ripley wouldn't get so stressed. It has improved some from the beginnng but there still is a long way to go.

At least Scout stopped hissing at Ripley some time ago.

Anyway, good luck.