We acquired 2 kittens last week and have been trying to integrate them with our existing cat. They have met a couple of times and there has been some hissing etc but nothing too much to worry about. We are using Feliway diffusers in the house to help the elder cat (he's 4) to come to terms with the change in circumstance. The kittens are being confined to one room with some supervised access outside of this. The main problem is that our existing cat is now only coming in to the house to eat. When he arrives he seems fine and likes being stroked/talked to/groomed etc but he is reluctant to venture further into the house. I would like to know how best to proceed to ensure 3 happy cats.