Individual Details

Joseph married Nancy Dunford, 3 Mar 1845.

1850 Census. Carroll Co VA, Dist 11. Hh 809
Joseph Harman, Sr., age 29. Nancy, age 22.
Patrick 4, Elizabeth 2, and Justin age one month
Note: I don't know why he has specified the designation "Sr" unless he has a cousin or nephew of the same name living in the area. There was in fact a Joseph Harmon, age 23, living with Nancy A. Harmon, age 68.

1860, Carroll Co VA, Sulphur Springs, Hh 1076
Joseph Harman, age 39. Nancy age 31
Patrick 14. Mary E 11. Jestin 9. Rebeca 6. Phebe C 4. William, 11 months.

1870 Census. Sulphur Springs, Carroll Co VA, Hh 310
Joseph Harman, age 49
Nancy, age 43.
Mary 22, Jestin 20, Rebecca 16. Phoebe 14. William 11. Nancy 9. Wilson 6. Maccumber 5. Wilbern, age 2.

Marriage records at FamilySearch. org
Mary E. Harmon, b. 1850, daughter of Joseph Harmon & Nancy, married Alexander Robinson, 21 Dec 1876, Carroll Co. The groom was age 40 and a widow; his parents were James & Catharine Robinson. Both bride and groom born in Carroll Co.
Jestin Harmon, the bride, age 20, married Samuel Bowers, age 18 on 30 Mar 1871, Carroll Co. His parents were William & Rebecca Bowers; hers listed as Joseph & Nancy Harman.
Tryphenia Harman, age 21, b. 1856, married David J. Secton, 22 Mar 1877, Carroll Co. His parents were John & Elizabeth Sexton; hers were Joseph & Nancy Harman. [this is the age of the child named Phoebe in the 1860 and 1870 censuses]

Birth

1827

Father	Patrick Harmon (1790 - 1857)
Mother	Mary "Polly" Melton (1800 - 1850)
Sibling	Elizabeth Harmon (1824 - )
Sibling	William Harmon (1829 - )
Sibling	George Harrison Harmon (1830 - )
Sibling	Rebecca Harmon (1835 - 1904)
Sibling	Nancy Harmon (1840 - )
Sibling	Wilson Harmon (1843 - )
Sibling	Mary "Polly" Harmon (1845 - )