,

You are momma cat...so hiss, growl, bump, grab the back of the neck...but you must let your cat know the behavior is unacceptable...more gentle...blow air at cats nose, use spray bottle,...what should eventually happen.....you just looking at him/her or saying a certain phrase to be used only when correcting a behavior that you don't like should be enough for the cat to go into displacement mode...like any young cat training must begin the first day at home...so don't give up considering kitty has had gotten away with this bad behavior....just like children- consistent and fair.