I am looking for information on the following Henry family.

From the 1850 Bertie Co. census

John Henry 24 M farmer b NC
Nancy Henry 56 F b NC
Robt. M. Henry 16 M student b NC
Celia A. Henry 13 F b NC
Mariah A. Henry 11 F b NC
Arbale Henry 6 F b NC

From the 1860 Bertie Co. census

John Henry 33 M farmer
Mariah 27 F
William I. 9 M
Van Buren 7 M
? 1 F

Next household lists
Celia Henry 24 F farmer
Abel Henry 16 F attending school
John Nixon 22 M on farm

Celia Henry married George William (Squire Billie) Cobb in 1867. They were my great-grandparents. I have a reference giving Celia's parents as John and Mariah Henry. The Nancy Henry listed on the 1850 census would possibly be too old to be the mother of the youngest child. Could she be the grandmother or an aunt?