Thank you all for your comments/suggestions. My first thought was taking Nikki (the elder) her to the vet, but money is tight at the moment and there doesn't seem to be any other issues. She's eating, drinking, pooping, peeing and bathing herself as usual. The suggestion of collars w/bells for the others is one I never thought of. I think we'll try it. Nikki has always been 'funny' about her personal space so announcing someone nearby might be a good thing for her. In the mean time, my room mate/friend has a knack w/cats. In fact the vet has called her the Cat Whisperer! She has taught them 1-2-3...on 3 if someone hasn't done what she asked, it's time out! Time outs are few and far between! The comments on not moving furniture makes sense, duh, why didn't I think of that Thanks again.