The case concerns whether parents’ rights are burdened if public schools do not allow them to pull their children when certain books are discussed.

In the kid’s book “Prince & Knight,” the handsome prince falls in love not with a princess, but with the knight. Some parents want to opt out of that story.

The U.S. Supreme Court is set to consider on Tuesday a bid by Christian and Muslim parents in Maryland to keep their elementary school children out of certain classes when storybooks with LGBT characters are read in the latest case involving the intersection of religion and LGBT rights.