Somewhat off topic, but I have often wondered if this sort of phenomenon could also occur within 'timelines' (as in the multiverse concept):

As the article mentions, initially our ancestry is basically linear -- one mother and father, two grandparents per parent, etc. But the further back we go, the more our lineage begins to resemble a mesh web with certain ancestors reappearing at other points.

Could the same happen with the flow of time? Say we were to go back 10 years, maybe there is only a single possible 'timeline' between now and then. But is it possible that the further we go back, there are multiple 'nodes' which cross over, much like ancestry?

Is it possible there were two, or more, say, 1900ADs, which then every e.g. 1915 was descended from, splitting again into different timelines before recombining, in much the same manner as biological descent?

Largely off topic, but an interesting thought experiment.