As far as I know, he only has the one child, a boy who is probably around 4 and a half. We were staying in the same hotel as David, his wife and their son 3 years ago and their boy was then around 18 months old, still in a high chair anyway when eating.
I think he just wants that side of his life kept private but I agree, no mention of them in any edit is a bit odd, even if it's just 'I miss my wife & son' would have sufficed, especially given all the fuss around Charlie & her daughter......