The ruling that gives the schools ie the states locos parents control over children when in school...or during school day if truancy is declared.
How do you think teachers can send children for abortions? Or do what they want during school hours.
https://parentalrights.org/understand_the_issue/supreme-court/
I see... I vaguely remember hearing about a case of grandparents and visitation, but I did not know its unintended (or maybe intended) consequences.