It would be very interesting if Geni or one of its partners would present some analysis of the following: Given the possibility, for instance, of legal fathers not being natural fathers, what, in general, is the likelihood of, say someone identified by Geni as, for example, as 35th great grandfather actually being being the actual natural great grandfather. I would guess that Geni could come up with some approximate probabilities based on number of generations and perhaps on other variables. Such analysis might be enhanced by DNA information that is readily available.