Caroline does not appear to have ever married or had children. She resided most of her adult life with her brother Samuel and his wife Kate, and died in 1929.
Sources
"United States Census, 1870," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MXWZ-TYJ : 12 April 2016), Cami Hutchings in household of Embrie Hutchings, Kentucky, United States; citing p. 21, family 14, NARA microfilm publication M593 (Washington D.C.: National Archives and Records Administration, n.d.); FHL microfilm 545,972.
"United States Census, 1880," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MCC1-H8F : 12 August 2017), Caroline Hutchings in household of Saniel Hutchings, Louisville, Jefferson, Kentucky, United States; citing enumeration district ED 107, sheet 443C, NARA microfilm publication T9 (Washington D.C.: National Archives and Records Administration, n.d.), roll 0422; FHL microfilm 1,254,422.
"United States Census, 1900," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:M94K-XD6 : accessed 15 January 2018), Caroline C Hutchings in household of Samuel Hutchings, Magisterial District 5, Precincts 21, 23 Louisville city Ward 2, Jefferson, Kentucky, United States; citing enumeration district (ED) 20, sheet 16A, family 321, NARA microfilm publication T623 (Washington, D.C.: National Archives and Records Administration, 1972.); FHL microfilm 1,240,529.
"United States Census, 1910," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:M2D2-JTB : accessed 15 January 2018), Carolyn C Hutchings, Louisville Ward 2, Jefferson, Kentucky, United States; citing enumeration district (ED) ED 57, sheet 2A, family 26, NARA microfilm publication T624 (Washington D.C.: National Archives and Records Administration, 1982), roll 484; FHL microfilm 1,374,497.
"United States Census, 1920," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MHL1-11K : accessed 15 January 2018), Caroline C Hutchings, Louisville Ward 2, Jefferson, Kentucky, United States; citing ED 59, sheet 6A, line 34, family 109, NARA microfilm publication T625 (Washington D.C.: National Archives and Records Administration, 1992), roll 579; FHL microfilm 1,820,579.
Find A Grave: Memorial #109025639 for Caroline Castleman Hutchings (1855–1929), citing Cave Hill Cemetery, Louisville, Jefferson County, Kentucky, USA ; Maintained by Todd Whitesides (contributor 47553735) .
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