On the issue of family; you need to be real honest with your wife. Having grown up in the military, it is an eventuality that you will deploy someday. Maybe more than once. She will do the single parent thing from time to time. I loved growing up in the military. I was always much more mature and independent than other kids my age. So, a little hardship won't necessarily be bad for your kids. Plus, base kids are the most accepting group around because everybody knows the drill (somebody is always the new kid, so everybody takes care of each other). Ask your recruiter for some of the spouse swag. There is a dvd about being a military spouse that might be fun for her. Dependent life is like running a marathon: it sucks, everyone thinks it doesn't sound like fun, but it builds strength and most people who do it are proud that they did.
As for TCOM, well, as I'm here now I can give you some OBLC/COT advice. You should plan for having ZERO summer break between first and second year. You might get a couple of weeks off, but not enough time to do anything but get drunk and prepare for year 2. It is in your best interest to get your first training done before school. OBLC overlapped orientation, so my schedule is totally jacked up between year 2-3 because I have to take the boards and then go straight to OBLC. This blows and I don't want anybody else to get hosed. Check your start dates and call the school to see if you can skip orientation (if you go Army. The AF kids all had time to go to COT, though they are talking about moving the start date for first year up a couple of weeks, so I don't know.). It was a waste of time. They lost any paperwork I turned in during orientation and I just had to do it again after school started anyway, and apart from the white coat ceremony, there just wasn't that much value added for the weeks worth of death by powerpoint about the gym or the tutoring center.
Congrats, by the way.