Parents "should stick with them, but they might demand teachers go back to work," Bryan added.
To win friends, the union has engaged in something of a publicity campaign, telling parents repeatedly about problems with schools and the barriers that have made it more difficult to serve their kids. They cite classrooms that are stifling hot without air conditioning, important books that are unavailable and supplies as basic as toilet paper that are sometimes in short supply.
"They've been keeping me informed about that for months and months," Grant said.
It was a shrewd tactic, said Robert Bruno, professor of labor and employment relations at the University of Illinois at Chicago.
"This union figured out they couldn't assume the public would be on their side so they went out and actively engaged in getting parent support," Bruno said. "They worked like the devil to get it."
But, said some reform advocates, public opinion could swing against the union relatively soon if the dispute seems to carry on with no resolution in sight.
Juan Jose Gonzalez is the Chicago director for the education advocacy group Stand for Children, which has hundreds of parent volunteers and was instrumental in pushing legislative reforms in Illinois. He says parents "are all over the map" in terms of their support for teachers or the school district.