Source 1. Will of Grandfather David Knapp dated 19 April 1843; Proved 23 Oct 1847; Mentions wife Hannah, of Cold Springs, dau. Betsey, wife of James Gillett, grandson David Kanpp Gillett, dau. Maria Wife of Nicholas
Anthony, grandson David Knapp Anthony. Executors were wife, Cornaline Wasson and theodore Hustis.
Source 2. 1850 Hanover, Allamakee, Iowa Census for father James Gillett; David is not listed and presumed deceased by 1850; Not mentioned on 1860 Iowa Census for James Gillett either;
Source 3. 1860 Wapello city, Iowa census pg 938 for David Knapp Gillett; (not looked up)
Source 4. 1870 Louisa, Wapello, Iowa census pg: 698 for David Gillett 30, Engineer, B: Conn; Louisa 21, B: Iowa; David 9 mos, B: Iowa; (Not this David)