1841 has only one John Edwards in Brixham, a mariner aged 35, wife Mary aged 35, son William aged 5 all born this county.
There is another household at same address (King St):- Mary Jones, 70 and Elizabeth Jones 20, both born this county, possibly Mary's mother and sister ?
1851 they are still in Brixham but John must be at sea, just Mary Edwards, 47, fisherman's wife born Brixham, and son William, 14, fisherman born Brixham. So we have an exact age for Mary.
Looking for Mary Jones born Brixham ~ 1804 :- there is a Mary Jones bap Aug 12 1804 Brixham St Mary, d.o. William and Mary Jones. looks a good fit.
Same church 17 Dec 1820, bapt Ann Elizabeth Jones d.o. William, a mariner, and Mary. Is this the Elizabeth Jones with Mary Jones in the 1841 census? If so we have the father's occupation.
Looking in censuses to find exact age of John Edwards:- 1861 there is a John Edwards, age 58, widower, born Brixham, a mate on the Satham/Latham off Holyhead. If this is him then this looks a good fit :- John Edwards s.o. William and Mary was born Aug 23, bapt Sept 11 1803 Brixham St Mary.
A Mary Edwards aged 57 of Lower Brixham was buried at Brixham St Mary Aug 4 1860 so that is correct for John to be a widower in 1861.
Elaine