Mary Jane was mentioned in the 9 May 1822 will of her father, Thomas Dennett, proved 21 May 1822. [Essex County, Virginia, Will Book 19, page 294.]

The estate of Thomas Dennett, deceased, in account with Josiah Minter. executor, from 1828 to 1829, was settled on 12 April 1834, with a balance due to the estate of Josiah Minter. This balance was settled by “cash recd. from Mr. John Crow Jr who intermarried with Jane Dennett the child & only heir of Thos. Dennett decd.” [Essex County, Virginia, Will Book 23, pages 272–273.]

1850 U.S. Census, Essex County, Virginia
Page 76B, Dwelling 190, Family 190
Crow, Mary, 35, female, $160 real estate, born in Virginia
Crow, Martha, 15, female, born in Virginia
Crow, Edward, 12, male, born in Virginia, attended school
Crow, Adaline, 10, female, born in Virginia, attended school
Crow, Albert, 4, male, born in Virginia