Md. Code, Family Law § 5–310

A party to a case under this subtitle may appeal to the Appellate Court of Maryland:

(1) in an interlocutory appeal, from a denial of the right to participate in a guardianship case before entry of an order for guardianship;

(2) in an interlocutory appeal, from a denial of the right to participate in an adoption case under Part III of this subtitle; or

(3) from a final order.