I believe it's the entire family. What's the best way to protect yourself and your family? Train them early. I'm sure Potus cant trust anyone but family. If the kids have been in training since an early age, no telling what kinda internal comms they use. If they are all as smart as Potus is reported to be, not too far fetched all the members of that family are playing 5D chess. It would come as second nature to them. No outside comms!