Every year I drive to North Carolina with my mother, and my older cousin. I was always the youngest in the family, but was always extremly good on long trips and on the few exceptions that I wasn't, my mom would just medicate me and knock me right out

. We just joke around and act like a bunch of clowns.
Soetimes we play the name/proffession game with names and porfessions which start with the same letter (Sales Samantha, Construction Carrie, Phone sex Phoebe!)
Just be creative