Heredity puzzle

I know this is wrong, but I’m going to use my privileged status as a source for Planet Mozilla (ok, it’s not that privileged) to point people to a non-Mozilla-related puzzle on my personal blog, because the few friends I have who read it are lame and haven’t come up with any answers yet. (Did I mean “the few friends I have, who read it” or “the few who read it”? None of your business.) And I really want somebody to come up with a simple, understandable proof.

Warning: it involves incest, intergenerational sexual relations, and time travel. But what doesn’t, these days?

 

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