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Serial monogamy creates a new kind of relative, the "ex-". The "ex-wife", for example, remains an active part of her "ex-husband's" life, as they may be tied together by transfers of resources (alimony, child support), or shared child custody. Bob Simpson notes that in the British case, serial monogamy creates an "extended family" – a number of households tied together in this way, including mobile children (possible exes may include an ex-wife, an ex-brother-in-law, etc., but not an "ex-child"). These "unclear families" do not fit the mould of the monogamous nuclear family. As a series of connected households, they come to resemble the polygynous model of separate households maintained by mothers with children, tied by a male to whom they are married or divorced. 
The Death of the Moth, and Other Essays , by Virginia Woolf, free ebook
Let’s start by asking what exactly an outgroup is.
So now at the turn of the road I saw one of these pictures. It might have been called "The Sailor's Homecoming" or some such title. A fine young sailor carrying a bundle; a girl with her hand on his arm; neighbours gathering round; a cottage garden ablaze with flowers; as one passed one read at the bottom of that picture that the sailor was back from China, and there was a fine spread waiting for him in the parlour; and he had a present for his young wife in his bundle; and she was soon going to bear him their first child. Everything was right and good and as it should be, one felt about that picture.