Hi, Suzanne.
Alfred could well be his brother. In 1851, Thomas would have been 17 and Alfred 6.
Many,many thanks ; this really helps. I don't have the 1851 and the 1911 census form that I have, presumably the individual's one, is signed by Thomas and only lists himself, his wife Emma and daughter Emma. Looks as though I have another branch to follow!
Regards
Nigel