I was just looking at the 1810 Stafford County Census again and noticed “Elizabeth Garrison” head of household…

Believed to be of Scottish descent RG2 Memoir

NAME: Elizabeth Garrison
HOME IN 1810 (CITY, COUNTY, STATE): Aquia, Stafford, Virginia
FREE WHITE PERSONS - MALES - UNDER 10: 1 Presumption: Rufus K (see notes for Rufus K, 1820 census)
FREE WHITE PERSONS - MALES - 26 THRU 44: 1 Presumption: William
FREE WHITE PERSONS - FEMALES - 26 THRU 44: 2 Presumption: William’s wife and William’s sister, Elizabeth or Nancy
FREE WHITE PERSONS - FEMALES - 45 AND OVER: 1 Elizabeth Ennis Garrison

My deductions and reasoning, referencing the JRG2 Memoir and the 1810 census:

• Elizabeth Garrison, head of household, must be Revolutionary War John’s spouse, Elizabeth Ennis Garrison.
• The other four people: son William, his spouse and their son and...
• Elizabeth or Nancy, daughter of Rev War John and Elizabeth Ennis

This points to William “staying" on the farm with his own family and mother. I have no source material on Elizabeth or Nancy.

1820 Census:
NAME: Rufus Garrison
1 male 16-25: Rufus, head of household.
1 female 26-44 1776-1794: mother (father, William, deceased)
2 females 45 and over <1775: grandmother, Elizabeth Ennis Garrison and aunt, Elizabeth.

National Register Sons of the American Revolution: John Rowzee Garrison, Washington, D.C. (1864). Son of John Rowzee and Frances (Hudson) Garrison/ grandson of Moses and Nancy (Atchison) Garrison; great-grandson of John Garrison, private Virginia Militia.

Reference: Virginia - Overwharton Parish Register 1720 - 1760, Old Stafford County

Garrison, John. Son of John and Nancy, born May 17, 1740 (page 62)

Garrison, Susannah. Daughter of John and Anne, born May 21, 1742 (page 63)

Kelly, John. Married Mary Garrison, November 1, 1745 (page 99)

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Memoir of John Rowzee Garrison II, Washington, D.C. November, 1879
Excerpt:
The writer of these lines, John Rowzee Garrison, was born in Stafford County, Virginia, on Monday, August 27th, 1838, in the same mansion in which my parents now reside, on my father's farm called "Clover Hill.” The dwelling house is quite near Ebenezer Methodist Church and about one mile from Garrisonvllle.
My father's name is also John Rowzee Garrison, but as a matter of convenience I have never added Junior in writing my name, since I always sign my name, J. R. Garrison. Among his neighbors in Stafford, he is nearly always called by his middle name (Rowzee).
My father was the second son of Moses Garrison and Nancy Garrison whose maiden name was Nancy Atchison. My Grandfather and Grandmother on my father's side, were both natives of Stafford County where they resided all their lives. They had four children, all sons: Roy A.; John R. (my father); Moses W. and James (who were twins); Roy A. M. Garrison, at the present time resides in Washington, D.C.; Moses W. Garrison in Montgomery, Alabama; and my father in Stafford County as before stated. James Garrison died a number of years ago.
Moses Garrison, my grandfather, was the son of John Garrison, also a native and resident of Stafford County. His wife, Betty (whose maiden name was Betsy Ennis) was of Scotch descent. My Great Grandfather, John Garrison had seven children, five sons, namely; Moses, Jesse, John, James and William and two daughters, namely Betsy and Nancy.
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John is found in the tax lists of 1785, 1787, 1788, 1789, and 1790. He also shows up in the earliest Personal Property Tax list I could find, 1807. However, he is not found after that. There is no tax list for 1808 and then in 1809, no John, but there is an Elizabeth. Guessing that this is Elizabeth “Betsy” Ennis, his widow. This puts Rev War John’s death around 1808. Makes sense b/c he does not show up in the 1810 census. Elizabeth disappears from the property tax lists after that one entry in 1809, so wondering if she passed away 1809-1810.