Hi all. I have a 3 year old cat who was behaved well until her sister had kittens. She would try to attack the kittens so we had to hide them. Then she started attacking her sister. They are mainly outdoor cats. She would attack either whenever she had the chance. Then she had 1 kitten of her own. Both of them have been spayed. Her daughter is grown now and she will attack whenever she has the chance. We try to catch her doing it to stop her. Is this normal behavior? Her daughter is constantly on edge as to when she is going to jump her. They get into pretty bad fights, but only because of the Mom.