FAA requires we brief all our pax. Since you are doing this you might as well merge these two ideas into one document.
Intro: Flying is a bit more complicated than driving in that driving is on two axis and flying is on 3. Additionally flying requires instructions and communications from ATC which must be adhered to. They may need to warn us of on coming traffic to avoid. A higher level of vigilance is required since if the engine quits we need to realize it asap and find an appropriate spot to land/crash. For these reasons I ask you follow these rules:
1. Do not talk to me when I or ATC is talking on the radio as I need to hear that communication.
2. An airplane can be almost anywhere going in any direction with few limits. I am watching for other aircraft to avoid collisions but it is difficult and always better to have a 2nd set of eyes so please feel free if you wish you can help watch for other aircraft. If you see another aircraft you may brake rule 1 if it appears to be heading for us or on a collision course. If you just observe an aircraft that is not definitely on a collision course for example while we are in the traffic pattern and they are not on a collision course, You can always just point at the aircraft without saying anything and I will pick them up visually as well and nod my head.
3. Please observe the sterile cockpit (no talking) when I am taxing, prepping for take off, adjusting instruments and radios, going through check lists or taking off, or in the traffic pattern departing or returning. If you need to say something raise your hand and I will nod if its ok to talk at that moment.
4. If you get excited and forget the above I might put my hand on your knee to remind you. If you keep forgetting your knee might be bruised before the end of the trip.
5. --instructions on how to get in and out of the a/c, use of safety belts and equipment, what I might ask you to do in the rear event of an off air field landing like hold the door open.
6. Flying is like being on a boat you might get motion sickness if you focus too much inside the cockpit you can avoid this usually but just looking outside the cockpit or laying your head back and resting your eyes. If you get hot, sweaty or clammy this could be a precursor of getting motion sickness. Direct cool air on your face, wet a rag and wipe your face and the sick bags are right HERE!
(you may also have a high altitude brief when flying above o2 levels; or over water brief or mountain brief)