Maryland Family Law Section 5-4C-05

      Only the following individuals may register with the Registry:

            (1)      an adoptee:

                  (i)      who is at least 21 years of age; and

                  (ii)      who does not have a natural sibling under the age of 21 years who has the same adoptive parents;

            (2)      a natural mother;

            (3)      a natural father; and

            (4)      a natural sibling.