Older Cat Behaving Badly Toward Younger Kitty!

If this tree was in the house before the second kitty arrived then I'd say that getting rid of this tree and getting a new one might be the answer. That way the tree never belonged to the first one. Cats are territorial. Hope this helps.

I've been there and in my experience the cats settle it among themselves. Honey does not seem too intimidated by Krystal or we would never see that picture.

Maybe try some feliway spray on the tree and have a plug in running too. Add some Rescue Remedy to their water to help them both relax.

I've got a similar situation going on with my cats (and they are mother and daughter!). Mom is always attacking the younger cat and hissing at her. Sometimes she runs her off the cat tree or chases her out of a room or off the bed. I've tried everything, including Feliway, but nothing seemed to work.

I finally decided to accept that this is just part of how they interact with each other (sometimes they seem to get along fine). It's sort of like my kids....oftentimes they'll fight like cats and dogs, but deep down they really love each other and the bickering is often just part of a power play and adds some excitement to their otherwise routine lives. Unless one of them is hurting the other, I wouldn't worry about it.