Legal Question in Family Law in Maryland

Since your custodial orders were issued by North Carolina, you could seek modification there to better enable enforcement. If you have custody for all but the summer then you could potentially seek to have jurisdiction transferred to Maryland, or file as you indicated to enforce the North Carolina orders through Maryland where there is divergence with the orders. Maryland may be the proper jurisdiction assuming the children are enrolled in school here and live predominately within the State of Maryland.

The application for registration is your request to have MD recognize the order from NC and to take jurisdiction of the case. This should be based upon the children having established MD residency for 6 months. If that is the case and MD accepts jurisdiction, you can ask the court to either modify or enforce the order if it is then being violated. It sounds like right now everything is in place but you are concerned about a repeat of the last incident this coming summer. If the current NC order doesn't specify a pickup date and location after the summer visitation, you could ask the MD court to clarify that, and also to establish your communication/visitation rights with the children over the summer.