The 9-year old is NOT going to like the change. That’s just a cat’s nature. They like things to move SLOWLY.
If you can, keep the two kittens in a separate room for a while. Allow the 9-year old to smell them through the bottom of the door. Eventually, he will become used to the scents. You’ll have an idea of this when he stops growling.
After this, slowly introduce the kittens. Be patient! I suspect that the 9-year old won’t exactly LIKE them, but he’ll come to tolerate them.
Speaking from experience...
That is exactly the advice I was going to give. I wish I had done this years ago when I introduced a 2nd cat to my male cat. We had feline war in my home for 3 months.
Thank you for your help. I think I will give Smeagol the run of the bedroom (where he spends much of his time anywhere) and the bathroom (his version of Disneyland) and let the kittens have the rest of the house.
Got to say you are probably right on. Cats are funny. Sometimes they take to strange cats and other times they never adjust.
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