Originally Posted by
pepperlru
It does seem reasonable for her dh to do the dropoffs in the morning, but like pps suggested, it would be nice to offer gas money and also do 3 days of pickups. Even though it seems like it's not extra work for him to take your son in, sometimes even a simple inequality can make things uncomfortable (as I know from experience with carpools and babysitting shares).
Another thing to take into consideration, and I don't know if it is something that matters to your friend's dh and his son, is that often a morning drive is a good time for a child to connect with a parent. My dh drives my older dd to school in the morning. We used to do a carpool, but after a while dh felt like it was important to him to have that bonding time in the morning with her -- he works long hours and during the week didn't have a lot of other time to connect. It is a time for him to have conversations with her, listen to music, get their day off to a good start in a way that didn't happen with other kids in the car.
Of course, my dd is older and often doing her own thing; it can be tougher to find connection with teenagers. Maybe it won't be an issue with the family you're carpooling with, but it never hurts to consider.