1850 census of Morgan Co., Ky, enumerated 14 Sep, lists on p. 126 as family #823:
William Robinson, 40, farmer; Nancy, 30, b. Ky; Mahala, 20; Anna, 18; Westley, 17; Mary, 14; Milton, 11; Sarah, 6. All children born in Ky.

This appears to be a blended family (unless Nancy’s age is off by at least 5 years), but I cannot find a marriage record for them in Morgan Co.