PharmBoy, I think you are a little late on that advice. And thousands upon thousands of adults can also tell you how horrible it was to grow up with parents who did not get along at all.
IMHO, having done this many times, it is the quality of the parenting that counts, not whether the parents are divorced or not. Messy divorces are bad, and so are messy marriages. Both cause a lot of damage to kids. Your wife suffered a mess, and that factor magnifies how bad it was to lose a parent. Yes, both parents are needed, but you can do this properly, or really poorly.
It sounds like tatertot and her soon-to-be-ex are doing a very decent job of the divorce, and will probably do a very decent job of being ‘co-parents’… as she said, the guy is a great dad, just not a great husband for her. Every divorce I’ve seen (and been through) where the parents were both tuned in to being parents FIRST, and where they put the welfare of the kid primary in the process of the divorce, the kids have managed very well. It is still never easy, but having the parents be grownups about it makes all the difference.
tatertot, your baby will always be your baby. Even after the phase of ‘vagueness’ before I started really relating to my dad again, I remained his ‘baby-daughter’ - he still slips and calls me that sometimes (and I’m 34 years old!), and I don’t mind at all (might have during the early teen years, but he didn’t slip back then). As long as you don’t embarrass him in public by calling him your baby in front of his friends, he’ll probably be just as comfortable being your baby boyo as he would have otherwise. If he can’t stand being your ‘baby’, he probably would have felt that way even if you’d been there all the time.
Extra hugs, and please do not guilt about using whatever tool comes to hand, even if it is a Barney song. If it felt appropriate at the time, it was. There’s so much that you have to roll with in this process, and so much that is outside your experience and expectations, getting hung up on one event is a waste of energy. Let the evil Barney moment go, and focus on the fact that you were doing two things with that - 1) placing your child’s welfare ahead of even your own usual standards, and 2) trying to make this seem less disastrous and more part of the normal flow of life (hey, if Barney has a song about it, it is common, right?). How can you fault yourself for that?
Hang in there. Great that your sibs will be around, too. And go with your feelings on things, too - if you just can’t bear being out of the country for that long, it might be time to look at different jobs. I know one set of parents who vastly rearranged their lives for the sake of their kids - to the point of the mom completely switching career tracks, and the dad buying a house in the same neighborhood, so that they could do joint custody without doing more than switching bus stops (same school, same activities, same friends, same neighborhood). You’ll have to feel your way through things (job change might not be feasible, say), but trust your gut.
And don’t worry about no questions. If you do it right, the questions will probably come out over time, slowly, as they occur to him. I can’t imagine coming up with a list of questions about things at that age - too much would be beyond my understanding and experience, unless I had friends who had been through it, too. Keep open to questions over time, and I’m sure you’ll hear a few.