Tjerck's ancestry has been shown as (1) father Nicholas, grandfather Jan (birth 1554) and great grandfather Fransz (1516-1564) or (2) father Nicholas, grandfather Cornelius Fransz (birth 1545) and great grandfather Fransz (1516-1564). It would appear the correct lineage goes through Jan and not Cornelius Fransz. It appears Jan and Cornelius Fransz were most certainly brothers. The parents of Fransz (1516-1564) were Cornelius DeWitt and Beatrix Slingeland. For those interested in the lineage of Beatrix Slingeland, her ancestry can be easily traced and documented to Charlemagne, Alfred the Great, Count Dirk III of Holland, etc. DeWitt cousins may want to check it out and have some fun in doing so...