Megalith tombs were family graves in European Stone Age
(PHYSorg.com Archaeology & Fossils)

In a new study published in the Proceedings of the National Academy of Sciences, an international research team led from Uppsala University discovered kin relationships among Stone Age individuals buried in megalithic tombs in Ireland and Sweden. The kin relations can be traced for more than 10 generations and suggest that megaliths were graves for kindred groups in Stone Age northwestern Europe.