Education Secretary Linda McMahon and the conservative group Moms for Liberty took to the Supreme Court steps Tuesday to recognize the 100-year anniversary of a landmark case that they said gave parents more control over their children’s education.

But advocates who spoke at the event are also anticipating decisions in two other pivotal cases that could affect the conservative-led parental rights movement.

Rosalind Hanson, who is part of a group of plaintiffs in Mahmoud v. Taylor, told Fox News Digital in an interview after the rally that she is optimistic about a forthcoming decision from the high court on the key religious liberty case. She said it came from Montgomery County Public Schools in Maryland refusing to allow parents to opt their elementary school children out of being exposed to books containing gender and sexuality concepts.