Hi Janet,
Did you realise there are two John Doe in the 1841 Census, one at Gt Dunmow who was in the workhouse and one at Finchingfield who has several siblings. The only one I can find in 1851 and 1861 is the son of Eli and Sarah Doe at Finchingfield. 1851 Census HO107/1785/6/4, 1861 Census RG9/1113/7/7.
Laurina