Customary law is an unwritten law recognized in the 1945 Constitution. One of the indigenous groups in Indonesia who still adhere to customs and practice their customary law is the Talang Mamak tribe. The Talang Mamak tribe is one of the indigenous communities that is still classified as an isolated tribe that lives in the interior of Riau Province and Jambi Province. The customary law of marriage is one form of customary law that is still carried out and obeyed by the Talang Mamak tribe indigenous people to date. In the implementation of marriage, it must be carried out gradually and continuously in accordance with customary law that has been in force since the time of their ancestors. Because indigenous people generally still carry out marriages based on customary law, they will give legal consequences to the status of husband and wife, children, and marital assets.
The main problems in this study are how to carry out marriages on the indigenous people of Talang Mamak tribe in Talang Jerinjing Village, Indragiri Hulu Regency, and how the customary marriage law affects the position of husband and wife, children and property in the Talang Mamak tribal community in Talang Jerinjing Village. Indragiri Hulu Regency.
The method used in this study when viewed from the type, then this study is classified into legal research observation by survey, which is a type of research that takes samples from the population and uses interview methods and questionnaires as a basic data collection tool. Whereas when viewed from its nature, this study is descriptive, namely the research intended to provide a detailed, clear and systematic description of the main research problems.
From the results of the study it was revealed that, in the customary law community of the Talang Mamak tribe in Talang Jerinjing Village, Indragiri Hulu Regency whose matrilineal kinship system carried out marriages in the form of semi-marriages which were gradual and continuous, starting from flirting, visiting, breeding, counseling, picking up, specialization, until the wedding party (gawai). Marriage carried out under customary law causes the husband to become a fine person in his wife's kinship, and the daughter becomes the successor to the mother's lineage. Whereas marriage assets can be divided into carrier assets that can be separated between husband's rights and wife's rights, and shared assets which are jointly controlled by husband and wife.