Porco...
As the Commander of the aircraft are you not LEGALLY required to ensure that every passenger has a safety brief or is familiar with the aircraft?
Even (?) on the smallest of aircraft, I ensure every person on board has a brief before engine start.
Gertrude - consider telling your passengers to stay quiet until you get outside the immediate airfield environment (100% ears to ATC and engine) then ask as many questions as they like about how you do it and what you think about, until you are some 10 miles from the destination airspace - then quiet again.