My parents have had a cat since her birth and is now 15 years old. She is a female calico short hair. I grew up with this cat and she displays mean behaviour to all family members. People are scared to walk by her in case she swipes or bites them. No one will pick her up because that could get you a bite. She occasionally desires affection when she wants food or water. She will sit on your lap but petting her can be dangerous as she is unpredictable. Doing some research I've come to discover that she received a lot of negative reinforcement growing up. My family just wasn't well researched enough to know that this doesn't work with cats. Is it too late to help her develop better behaviour?