Hello Baron,
I have been tracking my Sutton family for about 2 years - all born Dagenham. I have previously looked at yours because of similar names, and some of your family were born in Dagenham when mine were. My gr.gr.gr. gr. grandfather was also a Thomas but he died abt 1837. I have tracked yours 1841 to 1871 previously to see if there was a link - maybe a cousin. Your Thomas was a sawyer in 1841 census - age 50. Wife Sarah age 40. Children:-
Thomas 13, James 12, William 10, Johnathan 5, Mark 1. Living Salem House Collier Row, Romford. 1851 Living COllier Row. Sarah widow. Receiving parish relief. All children except Mark born Dagenham, Mark Romford. Thomas, James & Johnthan Ag. Labs. Also a granddaughter Sarah b. 1845 Romford. 1861 still Collier Row. Sarah (born Stapleford Abbots) with Mark occupation sawyer. My Suttons were Henry born 1837, mother Elizabeth Sutton. Hope this info is of help - I think they are your Marks - he was the only Mark born around then. regards.