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I see the same request has been made already, but unless you are into geneology, you won't understand what that file is that was indicated.
I, too, am attempting to build a family tree and would simply adore it if someone would take up the challenge of creating a module that would do this.
I would do it myself if I had the first clue, but this is beyond me - I have a feeling it would be quite complex. It'll certainly be a challenge to one of the great minds here!