Thanks for hanging in there for other's kids. My kids weren't involved in this field trip, but you would hope when a parent signs on to help they take it serious, and understand they are assuming responsibility for other's children not just getting a free day at the ball park with their kids.
BUT don't fear, there was a thread in here a few years back about what the teachers would do to help and protect our kids if, for example, there was an emergency evacuation at the Nuke Plant. MOST said they would do what they signed on to do and take responsibility and protect the kids in their charge.. others said they would leave the kids they are responsible for and go get theirs and evacuate, help just their kids. Leaving the kids under their charge to take care of themselves?
It's not just the parents.