The plot depends on a tangled set of village relationships. Before the opera begins, the mill-owner Grandmother Buryja's two sons have both married twice, fathered children, and died. Their wives have also died, except for the Kostelnička (widow of the churchwarden), the younger son's second wife and Jenůfa's stepmother. Custom dictates that only Števa, the elder son's child by his first marriage, will inherit the mill, leaving his half-brother Laca and cousin Jenůfa to earn their livings.