We have "cousins" who are not really related but who came from the same village in Sicily along with my family on the same boat, moved next door to each other in Pennsylvania and then they all moved to Detroit together and lived across the street from each other in Detroit. In reality, since the village in Sicily is very small and people all married people from the same village, there is probably some shared blood somewhere, but they lived as though they were very close relatives our whole lives.
Then you have my dad's siblings. His brother and sister married a sister and brother. Their kids are "double cousins" because they share both sets of grandparents. They are probably, genetically, more like brothers and sisters than cousins.
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