He married Martha Ann Thompson on 23 Aug 1854 in Parke County, Indiana.
It is possible that an 1860 US Census record from Parke County, Indiana could be him and his wife Martha, with two children:
Household Role Sex Age Birthplace
George Harvy M 26 Indiana
Martha Harvy F 23 Indiana
James Harvy M 2 Indiana
Mary Harvy F 1 Indiana
He was a young farmer at the start of the Civil War, and enlisted on September 15, 1861,
He was mustered into the Union Army as a Captain of Company I, 31st Indiana Volunteer Infantry. After participating in the battles of Fort Henry and Donelson in the spring of 1862, he was killed on the first day of the Battle of Shiloh, 6 Apr 1862, in Tennessee. His wife applied for and received a widow's pension in 1863. She never remarried after his death, and lived in Danville, Indiana until her death.
Also see George Caleb Harvey, 1833-1862 : Civil War hero (2005) by his great grand-daughter, Carolyn Harvey Lingeman.
He and his wife are mentioned in a marriage certificate for Otis C. Hadley and an un-listed female, presumably Mary T. Harvey. The marriage log lists the names of the bride's father and mother, but curiously, not the bride's name.
↑ "Indiana Marriages, 1811-2007," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:KZCX-7CV : 25 September 2017), George Harvey and Martha Thompsen, 23 Aug 1854; citing Parke, Indiana, United States, various county clerk offices, Indiana; FHL microfilm 2,209,418.
↑ "United States Civil War Soldiers Index, 1861-1865," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:FS56-Y2S : 4 December 2014), George Harvey, Captain, Company I, 31st Regiment, Indiana Infantry, Union; citing NARA microfilm publication M540 (Washington D.C.: National Archives and Records Administration, n.d.), roll 32; FHL microfilm 881,753.
↑ "Indiana Marriages, 1811-2007," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:V8M3-2JQ : 27 September 2017), George C Harvey in entry for Otis C Hadley and MM9.1.1/V8M3-2J3:, 29 Sep 1886; citing Hendricks, Indiana, United States, various county clerk offices, Indiana; FHL microfilm 1,316,573.