”No, I am your father.” 

Science is not a natural force, moving forward in a given evolutionary way. Science is driven by scientists, and those are individuals who do what they think is fun. And at the moment the new toy in the group is READ, the technique Torsten Günther developed for estimating kinship among ancient individuals (http://www.biorxiv.org/content/early/2017/06/23/100297). It is not demographic processes including continents and chronological periods. But it is a lot of fun. A man and a child buried in the same grave, is it a father and a son? Seven individuals of varying sex and age found on a small burial-ground, is it a family? An early medieval Christian cemetery, is it a family-cemetery or a village-cemetery? Those are questions that will not explain the Viking-phenomenon or the origin of the Neolithization. But they do bring us closer to prehistoric people, and they do help us understand the priorities of those who lived here. And that is massively fun and actually also important. I predict that in a year or so, we will see a few of those close kinship studies being published by members in our aDNA group.