Purple cat, first of all, welcome to Pet talk. I do not have this problem with any of my furkids, all 12 of them, although they live together each day. It may be that yours will "never" get along with each other. It could be that a 3rd cat may help the situation. As I am no expert on this subject, generally when I choose a pet to live with my menagerie, I will caress their paws and see how they react. If they accept it, then they are usally affable towards humans and other cats, and if not, then they would be best left alone as an only-cat within a humanfamily. Which one of yours can you do this paw caressing with without them rebelling against it, if either will allow it?

.........wayne