[1] His father, a staunch parliamentarian, had been dismissed from his office of Jurat of the Royal Court at the beginning of the English Civil War, but was reinstated along with his father-in-law by the council of state in August 1653.
It remained among the state papers until about the close of the 18th century, when it was transmitted to Admiral d'Auvergne, duke of Bouillon, the then naval commander at Jersey.
From his letters Dumaresq seems to have been an amiable, well-informed man, who devoted most of his time to gardening, fruit, and tree culture.
Shortly before his death he imparted to Philip Falle, who was then engaged on his history of the island, 'a set of curious observations;’ but what was still more valuable, an accurate survey of Jersey, 'done on a large skin of vellum,’ and 'equally calculated for a sea chart and a land map,’ which in a reduced form adorns the front of Falle's book.
By a licence bearing the date 24 June 1672 he married at the Savoy Chapel, London, Deborah, daughter of William Trumbull of Easthampstead, Berkshire.