Article 139 of the Mexican Immigration Law Regulation
The condition of permanent resident status provided for in Article 52, Section IX, of the [Immigration] Law shall be granted to the foreign person who demonstrates any of the following circumstances:
I. Have recognition of refugee status, granting of complementary protection, political asylum or determination of statelessness in terms of the legislation on the matter;
II. To have a relationship with a Mexican national or permanent resident alien, in accordance with the hypotheses of family unity in terms of the provisions of Article 55 of the [Immigration] Law;
III. Be a pensioner or retiree with sufficient monthly income to support himself/herself during his/her stay in the national territory;
IV. That it complies with the categories and the minimum score required by the points system, in accordance with the general administrative provisions issued by the Secretariat, which will be published in the Official Gazette of the Federation;
V. Have regular immigration status for four consecutive years, in the case of temporary residents;
VI. Be related in a straight ascending or descending line up to the second degree to a Mexican by birth, and
VII. To have a regular migratory situation for two consecutive years as a temporary resident, as long as the condition of stay has been granted for having a conjugal or cohabitation relationship or equivalent figure with a Mexican national or permanent resident and that such relationship subsists.
The foregoing is subject to compliance with the requirements established in the general administrative provisions issued by the Ministry, which will be published in the Official Gazette of the Federation.