27 of 35 individuals were close biological relatives across five generations. Family descended from four first-generation women who all reproduced with same man. Patrilineal descent placed men with fathers and brothers in tomb. Adult daughters absent, likely buried with male partners elsewhere. Childhood daughters of lineage buried in tomb. First-generation women determined north or south chamber burial. Stepsons adopted into lineage via mother's burial and her children with patriline male. Eight non-relatives buried, including three women possibly partnered with tomb males. Biological relatedness not sole burial criterion. Tomb architecture reflected family branches from two initial lineages.