The 1880 census lists both of her parents as being from Virginia. The fact that Margaret named one of her sons William Washington adds to my confidence that Washington was the middle name of her father. He was born at the outset of the Revolution and patriotic fervor was running high at the time.
"United States Census, 1850," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MDZQ-BXD : 9 November 2014), Margaret Hillhouse in household of Joseah Hillhouse, Camden county, Camden, Missouri, United States; citing family 275, NARA microfilm publication M432 (Washington, D.C.: National Archives and Records Administration, n.d.).
"United States Census, 1860", database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MHZL-GGX : 30 December 2015), Margret Hillhouse in entry for Josiah M Hillhouse, 1860.
"United States Census, 1870," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:M4XZ-TRC : 17 October 2014), Margaret Hillhouse in household of Josiah Hillhouse, Missouri, United States; citing p. 5, family 31, NARA microfilm publication M593 (Washington D.C.: National Archives and Records Administration, n.d.); FHL microfilm 552,263.
"Find A Grave Index," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:QVKL-H1S5 : 11 July 2016), Margaret Watts Hillhouse, 1895; Burial, Stoutland, Camden, Missouri, United States of America, Hillhouse Cemetery; citing record ID 48935761, Find a Grave, http://www.findagrave.com.
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