Quick answer
Focus on concrete child-safety facts and existing order terms, not disapproval alone.
Do now
Identify specific incidents, witnesses, dates, and effects on the child. Read any relevant restrictions. Seek advice about whether clarification, modification, or urgent relief is appropriate.
Watch for
Do not investigate through hacking, stalking, or coaching the child. An adult’s new relationship does not automatically justify denying ordered parenting time. Immediate danger requires emergency assistance.
Official sources
NJ Courts — FD modification application packet, NY Courts — Custody and Visitation, DC Courts — Family Court Self-Help Center.