Last summer I found out that backpacking with two tents and one adult can be an issue. I put my 11 yr old and 10 yr old in a tent by themselves and our big malamute. I slept with the 5 and 6 yr old in another tent. It took my 11 yr old a few reassurances that the malamute is better than dad for protection.

Incidentally, I always bring a glow stick for the kids for each night. One stick for the tent for each night. It is extra weight, but the kids sleep better with it. It does bother me a little, but eventually my mind ignores it.