He was about 16, and it was to be expecyed as he has been looking very thin for a while, but today when ex H went to feed them (parents are away), he was laying there like a rug. Ex H thought he had died & picked him up, but he let out a miaow. Vets were phoned & I have just had to sit in the car with the boys (who know nothing yet & loved that cat), while ex H took him in. He has been left there now & is going to be put out of his misery shortly. Haven't stopped crying since I got back in. The boys will be devastated when they find out.