The three appear in the Avery Store Ledger book of 1835. The census records show Jehu first appearing in the 1830 Federal Census in St. Clair County, AL just south of Etowah Co, AL and a place where soldiers of Andrew Jackson received land for service.
A " J." Littlefield appears on the 1840 Fed. Census in De Kalb County, AL with 8 persons in his family. De Kalb is just north of Etowah County and not too far from St. Clair County.
A "Jehue" Littlefield, age 63, born in SC, appears on the 1850 census of DeKalb County, AL with a wife, Catherine, born in SC, age 54, A Gibson Littlefield, age 16, born in AL, and a William Burker age 24.
A John LIttlefield, age 75 appears on the 1860 Federal Census in Duck Spring, close to Keener, AL and in what is now Etowah County, AL but might have been lying in DeKalb County earlier. He as living with Thomas J. burgess , age 45, wife, Rhoda Burgess, age 38.
Hope this helps with the Littlefield family. The three were probably descendants of William Littlefield of SC.