At one time we had 9 cats, all different personalities and great fun to interact with them.
Suddenly one cat developed a true hatred for another (they had been buddies for years)and if we hadn’t separated them, one would have been killed.
We had to put one upstairs while the other had the run with the family. We would switch cats twice a day so each could be with us and the other cats.
Years later, when both had reached old age (and senility) we tried to see if they could get along.
With trepidation we opened the door and let the cats mingle.
They looked at each other with a dull expression like saying “for the life of me I know there is something I need to remember about you but I can’t”.
Peace was restored and they lived a long life. One 22 and 1/2 and the other 19.
The one who hated the most was so good in helping nurturing the kittens we brought into the family, very loving toward them.
Great story!