Isaac Pitman was born in Trowbridge, Wiltshire, by the way. Cas has given you the 1881 census nad from that we can see that Charles Field was the younger of 2 brothers born at Briton Ferry and there was a third, still younger brother, born at Nailsea. Somereset, about 9 miles from Bristol. Charles' father was Isaac, age 30 born at Ston Easton, Somerest and his mother was Elizabeth, 34, born Brixham, Devon [it appears].
We find Isaac, age 20, also at Briton Ferry in 1871, boarding with another Devonian, John Blackford.
In 1891 we find Isaac remarried to a widow Phyllis [formerly Singleton]. the other children are with them and she has two daughters from a previous marriage, Hannah and Edith. Interesting is that Isaac's aged father is with them. He is Joseph age 70, also born Ston Easton. Charles is not with the family who are now at Raglan Lower.
Even the birth of Isaac is easy to find. He is registeed at Clutton, Somerset - March quarter 1851 Vol. 11 page 108.
We see him also in the 1851 and 1861 censuses - the easiest person to track that I have ever come across.
One clue to the Ted and family could be Charles brother, Edmund but those were normally Neds, not Teds.