Minangkabau have large corporate descent groups, but they traditionally reckon descent matrilineally. A young boy, for instance, has his primary responsibility to his mother's and sisters' clans. It is considered "customary" and ideal for married sisters to remain in their parental home, with their husbands having a sort of visiting status. Not everyone lives up to this ideal, however. In the 1990s, anthropologist Evelyn Blackwood studied a relatively conservative village in Sumatra Barat where only about 22 percent of the households were "matrihouses", consisting of a mother and a married daughter or daughters. Nonetheless, there is a shared ideal among Minangkabau in which sisters and unmarried lineage members try to live close to one another or even in the same house.