David married Ellen Sargent, age 16, on 1 Oct 1872. She died soon thereafter, and he married Mary Jane "Jennie" Williamson 14 Oct 1877. They had at least two daughters, the younger Lilly Coy Comstock.
Sources
"United States Census, 1860," database with images, FamilySearch (https://familysearch.org/pal:/MM9.3.1/TH-1951-25247-3294-85?cc=1473181 : 8 April 2016), Iowa > Cedar > Pioneer Township > image 18 of 20; from "1860 U.S. Federal Census - Population," database, Fold3.com (http://www.fold3.com : n.d.); citing NARA microfilm publication M653 (Washington, D.C.: National Archives and Records Administration, n.d.).
The Church of Jesus Christ of Latter-day Saints, "Pedigree Resource File," database, FamilySearch (https://familysearch.org/ark:/61903/2:2:SYRP-68L : accessed 2016-12-10), entry for David Crocket /Comstock/.
"Find A Grave Index," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:QV2Y-HNXP : 13 December 2015), David C. Comstock, ; Burial, Garfield, Whitman, Washington, United States of America, Garfield Cemetery; citing record ID 73864000, Find a Grave.
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DNA Connections
It may be possible to confirm family relationships with David by comparing test results with other carriers of his Y-chromosome or his mother's mitochondrial DNA.
However, there are no known yDNA or mtDNA test-takers in his direct paternal or maternal line.
It is likely that these autosomal DNA test-takers will share some percentage of DNA with David: