On the island of West Sumatra lives the largest matriarchy society in the world, 6 million Minangkabau. Famous in Indonesia for their matrilineal social system in which all hereditary property is passed from mother to daughter and the family tree is centered on women. The biological father is not the guardian of his child, it is the uncle (mamak) who plays this role.
During the wedding ceremony, the wife fetches the groom at his home with the women of her family, he enters the family group of his wife. The "customary law", the Adat, determines among other things, a set of traditional rules and non written codes in matrimonial and patrimonial questions, which predate Islam. For example, in the event of divorce, the husband gathers his clothes and leaves the home, the wife keeps the children and the house.