The following persons may not adopt:
(1) The guardian with respect to the ward prior to the approval of the final accounts rendered upon the termination of their guardianship relation;
(2) Any person who has been convicted of a crime involving moral turpitude;
(3) An alien, except:
(a) A former Filipino citizen who seeks to adopt a relative by consanguinity;
(b) One who seeks to adopt the legitimate child of his or her Filipino spouse; or
(c) One who is married to a Filipino citizen and seeks to adopt jointly with his or her spouse a relative by consanguinity of the latter.
Aliens not included in the foregoing exceptions may adopt Filipino children in accordance with the rules on inter-country adoptions as may be provided by law. (28a, EO 91 and PD 603)