Yes. Most family courts allow modifications to custody schedules when both parents agree or when there has been a significant change in circumstances, especially when the changes stay consistent with the existing custody agreement or child custody agreement. If you and your co-parent agree on a change, put it in writing, and date and save agreed changes to holiday plans with the rest of your schedule records, even an email confirmation helps. If you cannot agree, you may need to request a modification through the court. OurFamilyWizard recommends documenting all schedule changes to maintain a clear record.