I like to think he's been married, however in my fics/universe (which I'm in deniel of having more fics to write) I've already hinted at something and if I ever write the fic where Beth gets married, you'll find out more. Don't know if you guys want to be spoled or wait until/if I ever write that one.
I'm guessing that if anybody knows about Gibbs's first wife and child, then it'd be Ducky. We know that he knows about wives #2 & 3 - he even introduced one of them to Gibbs - and he seems to have known Gibbs for a considerable period of time, so it's not impossible that he would have known Gibbs when #1 was on the scene.
Nope, nothing more, just those 2. If I ever finish this Hustle fic and hopefully more MFU fics, like my Alias crossover fic (or at least get back to working on that) and I suddenly find more hours in a day, that and come up with the entire story, I'll write the wedding fic.
but since none of the above wil happen anytime soon..
The URL I posted worked fine for me. Its called Ready By SilentTrainConductor #48 as of now. Towards the bottom of page 2.