The birth certificate for John Waterfield, 3/1/1840, shows he was another illegitimate son of Elizabeth Waterfield. He was brought up mainly by his grandparents William and Elizabeth Waterfield.
Interestingly in 1841 John is living with grandad William in Fore Street, Stonehouse, whilst his mother Elizabeth is living with grandmother Elizabeth at Emma Place West, the address given on the birth certificate. In 1842 Elizabeth had another illegitimate son, James, in Tavistock Workhouse, who was brought up by her uncle William Martin.
1851 living 3 Lower Batter Street, Plymouth with both grandparents and their family but mother Elizabeth is missing. I believe Elizabeth is working as a servant in Barton terrace, Dawlish.
1861 living 3 Lower Batter Street,with grandparents and also mother Elizabeth. Occupation merchant seaman.
John married Fanny Lander 3/4/1867 occupation mariner. Father given as William Waterfield, mason - as he was brought up by his grandfather did he consider him to be his father? Witnesses were Elizabeth Phillips and Peter Lander (bride's father). Address given as Looe Street, Plymouth
Does this help solve the mystery at all?
Mo