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Answer: They did not spend time with their loved ones, at least not the whole time: Sometimes Sarah would feel that "no, today you don't [love me.]" and once a Borden twin says to Olivia, after she kissed him, that "it feels wrong sometimes". Furthermore, there is a scene where Borden tells Fallon (his twin) that he should talk to Sarah after a struggle, indicating that this particular Borden is not Sarah's husband and this particular Fallon actually is. As to why the alternate: One theory is that they HAVE to alternate to minimize diverging life experiences, both on stage and off stage. They both have to live the life of the other so that none differs too much in order to not reveal these differences to outsiders. In the book however, they do not alternate between the women, but that is another story [literally].

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