He married second August 10, 1749, Jane, widow of Moses Dimon and formerly widow of John Hill. 
Gideon wrote his will January 22, 1750/1, and it was proved Feb 5, 1750/1. In it he mentioned his wife Jane, sons John, David and George; daughters Sarah Keeler, Abigail Wakeman, Mary Penfield, and Hannah Gibbs; and granddaughter Sarah Hanford.
Gideon Allen died at Fairfield January 25, 1750/1. Buried in Old Burying Ground, Fairfield, Connecticut. 
↑ 2.02.12.22.32.42.5Families of Old Fairfield. (Online database. AmericanAncestors.org. New England Historic Genealogical Society, 2008.) Originally published as History and Genealogy of the Families of Old Fairfield. Compiled and edited by Donald Lines Jacobus. 2 vols. New Haven: The Tuttle, Morehouse & Taylor Company, 1930-1932. Reference Volume 1, page 14-15. $Subscription
↑ "Connecticut, Vital Records, Prior to 1850," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:QPQH-5P68 : 21 September 2019), Gideon Allen, ; citing Marriage, , Compiled by Lucius A. and Lucius B. Barbour, housed at State Library, Hartford, Connecticut; FHL microfilm 008272218.
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It may be possible to confirm family relationships with Gideon 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 DNA with Gideon: