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Joe Dennis Caldwell is the son of Samuel Caldwell (?-1986) and Albertine Williams (1889-1971). His siblings were Elvis Caldwell (1912-2001), Samella Caldwell, Minnie Lue Caldwell, Cullen Caldwell (1917-1998), Mattie Bell Caldwell, Alfredia Caldwell, Richard Caldwell.
Joe Dennis Caldwell's wife is not known. They had five known children named JoAnn Caldwell, Dennis Caldwell, Sheila Caldwell, Karen Caldwell, and Cheryl Caldwell.