The natural guardians of a Hindu minor; in respect of the minor's person as well as in respect of the minor's property (excluding his or her undivided interest in joint family property), are--
         (a) in the case of a boy or an unmarried girl--the father, and after him, the mother: provided that the custody of a minor who has not completed the age of five years shall ordinarily be with the mother;
         (b) in the case of an illegitimate boy or an illegitimate unmarried girl--the mother, and after her, the father;
         (c) in the case of a married girl the husband:
     Provided that no person shall be entitled to act as the natural guardian of a minor under the provisions of this section--
         (a) if he has ceased to be a Hindu, or
         (b) if he has completely and finally renounced the world by becoming a hermit (vanaprastha) or an ascetic (yati or sanyasi).
     Explanation.--In this section, the expressions "father" and "mother" do not include a step-father and a step-mother.