1870 census of Rowan Co., Ky, Cross Roads precinct, enumerated 27 June, lists on p. 1 as family #7:
Purvis, Joseph, 25, farm laborer; Margaret, 60, keeping house. Both born in Kentucky.

(This Margaret would be Joseph’s mother.)

Her death certificate records Margerite Purvis, age 82 years 5 months 2 days, born 14 Oct 1830 in Fleming Co., died 16 Mar 1913 in Moores Ferry, Bath Co., Ky, widowed, father Thomas Reeves, mother’s maiden name Jane Filson, both born in Fleming Co., cause of death old age, informant L. P. Reeves, Moores Ferry, Ky.

1900 census of Bath Co., Ky, White Sulphur precinct, enumerated 2 June, lists on p. 2A as family #31:
Purvis, Joe, 56, b. May 1844, farmer; Margret, wife, 69, b. Oct 1830, married 28 years, mother of 1 child, 1 living.