There are 4 common reasons a cat may bite a family member: Modifying bad behavior requires careful timing of a mild safe correction, like a loud noise, squirt with a water pistol, or just moving away from the cat. Swatting at or hitting a cat is not effective. The cat also needs to be encouraged to exercise and play attack an approved prey object. You should avoid repeating situations where the cat has previously showed biting behavior. For some cats it is necessary to limit lap time. I encourage an office visit to evaluate the cat if you think there is unusual biting behavior.