I am trying to understand why some work and some don't. Actually, I'd say about 95% of children conceived or adopted by a superhero parent or parents tend to disappear.
I don't have a huge knowledge of non-manga comics, though I have read a bit. Here's a list of what I know.
Chris Kent didn't work (story wise, not popularity wise; not sure how popular he was); I believe the character ended up in Phantom Zone or dead after the War of the Supermen? My memory of that story is fuzzy.
Damian so far has worked out rather well as he's now Robin and appearing quite a bit, though apparently not enough to merit his own book.
Wonder Woman never had a child (well that I know of at least). I suppose Cass could be a surrogate daughter in pre-Flashpoint, though it's doubtful they even know each other now.
Animal Man has two children, and I suppose we'll have to wait for Rotworld to finish to see their status.
Barry had children, twin tornadoes, who gave birth to others like Bart and Jenni. That's all but gone now I think, though I am a bit fuzzy on the LOSH stories too.
So out of those I could think of, really only Bruce and Buddy have been ongoing parents, though feel free to add to the list. There seem to be many more failed attempts than successes.
Why do you think some attempts to create a family or child/ren for any particular hero fails and others succeed? What does Batman and Animal Man have that apparently Clark and Hal and Barry etc doesn't have?