I did see this thing on the discovery channel about this gal who failed a "maternity" test for her kids. Even though she gave birth to them, they did not appear to be related to her when their DNA was tested. Turns out there is an extremely rare condition where basically a set of twins develops into one person, who has more than one genotype (most of her cells had one genetic profile, others had a different profile). I believed they called it "chimera" syndrome. In her case, her reproductive system was forming egg cells with her "other" genotype. A very weird deal indeed. They profiled several people who had the condition.

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