California runs on the caregiver's authorization affidavit at Family Code §6550. Any adult over eighteen with whom the child lives may complete items one through four and enroll the child in school; a qualifying relative who completes items one through eight gains the medical and dental consent rights Probate Code §2353 gives a guardian. No notarization, no court stamp, and Education Code §48204 makes it sufficient proof of residency. The Family Preparedness Plan Act of 2025 widened the definition of relative and revised the form, so older wording may draw questions. The parent's decision always supersedes the caregiver's on medical care, and the affidavit dies once the child stops living with the caregiver.
Texas is the most formal. An authorization agreement under Family Code Chapter 34 must be sworn before a notary, runs six months, and renews in six month terms unless an earlier date appears. The trap is §34.005: if only one parent signs, a copy goes to the other by certified mail with return receipt inside ten days, and the agreement is void without it. Enrollment is separate, since a student entitled to enroll under Education Code §25.001 cannot be turned away for lack of one.
Florida offers no self executing caregiver affidavit. Temporary or concurrent custody by an extended family member runs through the circuit court under Chapter 751, with a petition, notarized parental consent and a hearing. What works without a judge is a written power of attorney for medical consent, recognized at §743.0645.
New York uses the designation of a person in parental relation under GOL §5-1551, reaching school and health decisions for up to twelve months. The detail that catches families out sits in §5-1552: a designation signed but not notarized expires after thirty days, whatever end date the parent wrote in. Elsewhere, six months is the safe planning assumption, and when the need outlasts it, court appointed guardianship beats a stack of renewals. The family and divorce documents section covers the related custody paperwork.