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Sending you love and blessings at the loss of your wife. I have 2 cats who squabble. The older (Aurora) probably should have been an only cat, but we had another cat when we got her and stuck it out. When that cat died, we got a kitten (Cliocatra), who is now fully grown. Clio still tries to play Aurora but Aurora isn’t interested. They often sleep on the same bed when we are in it, though not always. I do use Comfort Zone (not sure what the difference is between this and Feliway besides the brand name), but only in the kitchen, where they’re fed. I can tell when it needs to be changed because Aurora gets more aggressive, so probably worth a try. I reward both cats for good behavior (nose touching without a fight and other things). I’ve learned that rewarding good behavior is a thousand times more successful than punishment. If you can find a way to reward them when they’re peaceful and calm, this might help. Good luck!