Cats don't get along anymore - I've tried everything
We have 3 cats - a mother cat and her two kittens. (The kittens are grown up, actually) We had the mother cat fixed shortly after she had a batch of kittens, and kept two from the litter, a male and a female. They used to get along fine, sleeping together and playing together. However, a few days ago, we took the kittens in to get fixed. The mother cat was calling for them the whole time, and couldn't figure out where they had gone. When we brought the kittens home, the mother cat growled, hissed, and hit them on the head. We kept them separate then for a few days, and tried reintroducing them, with no avail. Now, the mother sits at the food bowl growling, while the kittens cower in the corner. The two kittens still get along fine, but they are petrified of their mother. We tried the scent-swapping thing, and it didn't seem to work. The mother cat doesn't even bother to take a sniff; she just takes one look at them and repeats the head-bopping thing. What can I do? Nothing seems to be working.