Custodial interference occurs when one parent or guardian unlawfully prevents the other parent or guardian from exercising their legal rights to see or care for their child. This can happen through actions like refusing to return the child after a visit or not allowing contact during scheduled times. Such interference can lead to legal consequences, as it violates custody agreements established by the court. Courts typically encourage cooperation between parents to ensure the child's best interests are met, and custodial interference can disrupt this balance, potentially resulting in modifications to custody arrangements.