The GUARD Act would amend federal child abuse prevention funding rules to penalize states that take action against parents or guardians who refuse to support gender-affirming medical, surgical, or social treatments for minors. The bill defines such opposition as a protected parental right and would disqualify states from receiving funding under the Child Abuse Prevention and Treatment Act if they take adverse action against parents for refusing these treatments or social changes related to gender identity. The legislation allows parents, guardians, or legal representatives who experience discrimination from a state receiving such federal funding to sue in federal or state court to stop the state's funding and require the state to return the awarded money to the treasury. The bill does not specify any new funding amounts or implementation timelines beyond establishing these enforcement mechanisms through the courts. This legislation would primarily affect child welfare agencies and parents involved in disputes over gender-related medical or social decisions for minors.