What was the point of the subplot about the inlaws?
Why include Vera's husband's brother and his wife into the film?
What was the point of showing them trying to get pregnant? And then eventually getting pregnant? Why spend time on that?
I thought that it would later somehow tie into the film. Maybe the sister-in-law would not want the baby and attempt to get an abortion from Vera.
Or maybe it would be a contrast to the scenes of unwanted pregnancy. Maybe the point of the film would be that while many babies are unwanted, pregnancy can be a wonderful thing too and therefore Vera's actions are morally ambiguous and at least somewhat questionable.
But, no, nothing like that happens. The sister-in-law gets pregnant, is angry when Vera's actions are revealed and then the movie drops her and the brother alltogether.
Why include them if nothing is later done with them?
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