Maryland Family Law Section 5-204

      (a)      (1)      If a minor child has only 1 parent, the domicile of the child is the same as that of the parent.

            (2)      If the parents of a minor child live together, and the child lives with them, the domicile of the child is the same as that of the parents.

      (b)      If the parents of a minor child live apart, the domicile of the child is the same as that of:

            (1)      the parent to whom custody is awarded; or

            (2)      if custody has not been awarded, the parent with whom the child lives.

      (c)      If a minor child does not live with either parent, the domicile of the child is the same as that of the person who acts in the capacity of a parent.