Sorry to hear about the rough year, I hope this cruise is relaxing for you. Me and my family are on this same cruise also. We chose it since our 14 year old son will be out of school that week. This is our first RC Thanksgiving cruise, but we have been on 2 Thanksgiving cruises with DCL and there were loads of kids, of course. With Thanksgiving week being a school holiday, I would expect there to be more kids on this Harmony cruise than other weeks in November. But the ship is so huge, I am sure you will have a great time.
Enjoy your cruise.