Quick answer
Check the decision-making provisions and any tie-breaking or dispute-resolution process in the order.
Do now
Gather the relevant school or medical recommendations, deadlines, and order. Communicate the specific decision and supporting information through a safe channel. Ask about court clarification if necessary.
Watch for
Ordinary disagreements and urgent medical needs require different responses. Do not block necessary emergency care or assume the parent with more overnights has unlimited decision-making authority.
Official sources
NJ Courts — FD modification application packet, NY Courts — Custody and Visitation, DC Courts — Family Court Self-Help Center.