why would you want to know about his child?
It's also really sad that I have to qualify this with an answer but for the naive, I will.
As a father and as a son who lost his father, I feel for the son who lost his. It's devistating at any age, but to be young, and I'm assuming he's either around as old as my son (11 1/2) or younger would be especially more devistating and is probably asking alot of questions that are difficult to answer at this time. When I here of things like this I always think of my son.