Researchers were unsurprised when they found that Chardonnay was a direct descendant of the Pinot variety. The surprise was that if Pinot was the mother, a variety called Gouais blanc was the father, a variety so far on the other side of the tracks that is it is no longer grown in France or the U.S. In fact, according to an article in UC Davis Magazine (Winter 2000) “several unsuccessful attempts to ban it were made in the Middle Ages.”
Carole Meredith is the same grape DNA authority that conclusively proved that Petite Sirah, a variety grown in California whose provenance was uncertain, was in fact Durif. Another grape the French gave up on. Possibly because in their wetter climate the tight clusters develop rot.
If God forbid your daughter runs off with a low life miscreant, tattooed and unemployed, take heart from the mighty Chardonnay. Your grandchildren may turn out OK. According to Meredith, Gouais blanc and Pinot have been successful parents, perhaps because of their genetic diversity.