Originally Posted by Love4himies
Could he have had a congenital heart defect too? Perhaps something that wasn't going to rear it's ugly head until the kitten got to a certain size and then could not properly provide the body with enough blood?
The chances are that he and Timmy weren't biologically related. Timmy and the other orange tabby were likely just placed with Maddie and the gang.. so it's be pretty impossible for two technically un-related kittens to both have rare congenital heart defects
I mean, just to have Timmy already have a serious condition then this one suddenly dying.. pretty horrible.