We have 3 cats in our household all fixed 2 males and a female. Mr Kittty is the oldest at almost 18 years old and still as active as ever. Then there's Risotto who is essentially a rambunctious 7 year old toddler then 3 years ago we rescued a female siamese mix who was more than likely dumped. It took several months for her to even show herself and now she's essentially my shadow with me every minute of every day. The problem we are having is Mr Kittty constantly terrorizes her. It has gotten to the point he waits until she goes to sleep and goes for her neck while she's sleeping. He has started doing this thing recently where he acts like he's being nice rubs on her then in the blink of an eye his ears go completely flat and he attempts to maul her. We have two giant water feeders and as soon as she starts to drink he goes after her. I have to close him in the laundry room to feed him or he'll attack her and steal her food. I'm not sure if it's because of his age or if he just doesn't like her in the least. When she first started coming out more after we got her he was nice but as time goes on he's more and more mean to her.
For example, a typical day consists of Mr Kittty attacking Derp (the female) me shooing him away, him running off and meowing REALLY loud almost as if he's throwing a tantrum. Then That loud meow signals to Risotto, so Risotto starts instigating as well. It's not uncommon for him to trap her under the bed while we're sleeping and all you hear is that low pitch growl and I see a tail sticking straight out from under the bed then her screaming bloody murder as he tries to get her.
After that long winded rambling I guess my question is what can I do about this? It has me somewhat worried we're going to be out one day and we come home and something has happened.