1850 census of Morgan Co., Ky, enumerated 21 Sep, lists on p. 145 as family #957:
Bryant Fannin, 59, farmer, b. Va; Hannah, 37, b. Ky; Nancy, 15; William, 12; Elizabeth, 10; John, 8; Francis, 6 (m); Catherine, 2. All children born in Ky.

The next household is headed by Hannah’s son James H. Williams.

1860 census of Morgan Co., Ky, district 1, West Liberty P.O., enumerated 21 July, lists on p. 87 as family #538/533:
Hannah Fannin, 47, farmer; John C., 17; Francis, 15; Catherine, 11. All born in Kentucky.

(The gender column for Francis contains a mark that is a cross between what the census taker uses for F and M, as if it started out as an F and finished as an M.)

They are either sharing a household with Hannah’s son James H. Williams, from her first marriage, or else the census taker forgot to put down new numbers. (The line for James is formatted as if he were a head of household, except that there are no household/family numbers on his line.)