You're quite welcome, sorry it's not helpful for your situation. I guess putting signs up by their plates, e.g. Renal and YumYum, probably wouldn't help any?
We have a 20 year old, a 12-14? year old, and a 7 year old inside. Some time ago I started just leaving food out for them to come graze as needed. It seems to have worked out well for them, nobody's fat and nobody's starving.
The oldest cat, River, chows down as needed. Punkin aka Pretty Girl...
