Ouch, now that are real bad news, so sorry to hear about this, poor cat and you are doing the right thing in not putting him down just yet – I would do the same, as long as he is enjoying his life and doesn’t suffer constantly, there is no need to end things. You do the precautions for your other two cats and give him the care he needs and that is more than enough. And you will know, when the time is right, no doubt about that… *cuddles Charmax*