I know your pain, I had the same situation happen a few years ago. I had to choose 1 out of three, nephew, 2 best friends. I took the nephew, as to not piss off only one friend. I wanted to coin flip with my friends, but family pressure to take the nephew won out. We did not have the opportunity to take extra pictures, there were a lot of people in line. Our picture taking experience lasted about 15 seconds, Alex commented he loved my license plate, hand shake, two pictures and we were gone. I would coin flip between your friends, about the only fair way. Good Luck.