What's wrong with "You do the left, I'll do the right"?

My brother and I did that all the time. Communication and Trust.

When we used to tie down outside, Margy would hop into the cockpit
and volunteer to do that part of the preflight while I did the outside.

Interesting. Mary and I *never* split the preflight duties. The PIC
always does everything from start to finish. We decided to do this
from the first day Mary got her ticket and we had two pilots on board,
under the theory that we would be less likely to forget something.

This system also evolved because one person had to be the "parent in
command", meaning that the "other pilot" was in charge of keeping the
kids from beating each other bloody. Although we are long past
needing to do that (well, most of the time!), the procedure just
stuck.
--
Jay Honeck
Iowa City, IA
Pathfinder N56993
www.AlexisParkInn.com
"Your Aviation Destination"