Different name for the wife here and Grimmer's age still showing born c1855.
1861 Census Littleport
Plantation Farm
William Fincham, head, 48, Ag Lab, Mildenhall Suffoulk
Sarah, wife, 44, Littleport
Joanna, dau, 18, Ag Lab, Littleport
Tamar, dau, 15, Ag Lab, Littleport
Eady, dau, 12, Ag Lab, Littleport
Sophia, dau, 10, Scholar, Littleport
Grimmer, son, 6, Scholar, Littleport
John, son, 4, Littleport
Jethro, son, 1, Littleport
George Wooland, boarder, 22, Ag Lab, Littleport
RG9/1040
Folio: 71
Page: 7
Regards
Darcy