Social Security Death Index
Online publication - Provo, UT, USA: The Generations Network, Inc., 2007.Original data - Social Security Administration. Social Security Death Index, Master File. Social Security Administration.Original data: Social Security Administration. Social Security
It may be possible to confirm family relationships with Jack by comparing test results with other carriers of his Y-chromosome or his mother's mitochondrial DNA.
Y-chromosome DNA test-takers in his direct paternal line on WikiTree: