(b) Where the tenant is a minor or a widow or a person subject to any mental or physical disability or a serving member of the armed forces, then subject to the provisions of clause 791 (a) the right to purchase land under section 32 may be exercised ( i ) by the minor within one year from the date on which he attains majority; (ii) by the successor in title of the widow within one year from the date on which her interest in the land ceases to exist; Provided that where a person of such category is a.member of a joint family, the provisions of this sub section shall not apply if at least one member of the joint family is outside the categories mentioned in this sub section unless before the 31st day of March 1958 the share of such person in the joint family has been separated by metes and bounds and the Mamlatdar on inquiry is satisfied that the share of such person in the land is separated, having regard to the area, assessment, classification and value of the land, in the same proportion as the share of that person in the entire joint family property, and not, in a larger proportion.