I think that will be on a state by state basis as from my understanding the individual states set the vaccine requirements for schools. I guess the federal government could try to do something along the lines of the OSHA requirement but I think that would be a political misfire in this environment. Most of what (all) politicians do is to get reelected and I think mandating child Covid vaccination would not work in the current administrations favor especially considering what a good job the republican party has done leveraging the boogey man of critical race theory. So I am doubtful that they mandate vaccines for kids. I could be wrong though.