Awww. I can totally relate to this because my Nikko gets carsick everytime we ride to my mom's house. It is about 45 minutes away by car (if the traffic is light) and he always tosses his cookies at least 3 times
I hate when that happens because they look so miserable. I try not to feed him before we go and he will still find a way of puking something. But at least your boys held on long enough. For that they should be commended