The new vaccines for COVID-19 have not passed Phase III clinical trials yet. They will not be completed until April 6, 2023 (Pfizer/BioNTech), February 14, 2023 (Moderna), and January 3, 2023 (Johnson and Johnson). These are new pharmaceutical products that don't even meet the definition of a vaccine in that they do not keep one from contracting the virus. Even the CDC has admitted that people who have been vaccinated are able to contract and spread COVID-19. Numbers coming out of the U.K. are showing a higher instance of death in vaccinated people compared to unvaccinated - as well as lower efficacy as the days pass by. There has not been enough time passed yet to check for long term safety analysis. Therefore it is unknown whether or not these experimental products may cause autoimmune disease, allergy, cancer, reproductive harm, or cardiac, vascular or neurodevelopmental disorders.
Because vaccinated individuals are capable of contracting the SARS-CoV2 virus, the use of masks and requiring all students and staff to be vaccinated may not work at all. It does not currently reduce the risk of transmission. The development of serious risk or hospitalization to individuals <19 is much lower than the risk of developing a side effect like myocarditis.
The ethic of informed consent includes the right of individuals to accept or decline a pharmaceutical product or medical interventions. This right has been universally affirmed as a human right by ethicists, medical societies, Virginia regulation, institutional patient bills of rights, and the United Nations Universal Declaration of Human Rights. Let parents and individuals assess the risk or benefit for themselves. Do not mandate this.