The Discovery Channel show indicated that CC's DNA did not show a Jewish connection. But that is all they proved pretty much.
The Mysterious History of Columbus
by John Noble Wilford"One notarized document in 1479 concerns testimony by Columbus, then a resident of Lisbon, who had been called back to Genoa in connection with litigation over a trip he had made to Madeira for Genoese shipowners; the witness was stated to be 'about twenty-seven years old.' Domenico, the father, was a wool-weaver, as his father, Giovanni, had been. He was a sometime tavern keeper and wader of the Porta dell'Olivella, the eastern gate of Genoa." [p 58]