The Briggs children attributed to Rhoda and John all have GRO records giving the mother's maiden name as Pedgrift with no reason to assume they belong to Susannah (Henry, James, George, Samuel, Hannah, Rosanna and Charles). There are no impossible intervals between the births.
I have no idea where Rhoda and Johns children are in 1851. Only three as far as I can see. Mary, William and Henry. Mystery.
Umm... where are you looking? On the Ancestry version of the 1851 Census there are: At Bungay,10a, Household schedule number 10 Piece 1804 Folio 490 Page number 3: John Briggs 37 Rhoda Briggs 41 James Briggs 11 George Briggs 7 Samuel Briggs 5 Hannah Briggs 2 Rose Ann Briggs 1 Mary Lagon 21 Wm Lagon 19 Henry Briggs 13
Umm....Family Search. So far FS has served me well but this time they must have accidently left half the family off.