Md. Code, Family Law § 9–301

(a) In this subtitle the following words have the meanings indicated.

(b) (1) “Lawful custodian” means a person who is authorized to have custody of and exercise control over a child who is under the age of 16 years.

(2) “Lawful custodian” includes a person who is authorized to have custody by an order of a court of competent jurisdiction in this State or any other state.

(c) “Relative” means:

(1) a parent;

(2) a grandparent or other ancestor;

(3) a brother;

(4) a sister;

(5) an aunt;

(6) an uncle; or

(7) an individual who was a lawful custodian before the commission of an act that violates § 9-304 or § 9-305 of this subtitle.