 Frederick's father's brother, Raisley Calvert, who died in 1794, was a sculptor, and is well known as the friend and admirer of William Wordsworth, to whom he bequeathed 900 pounds.Raisley had been to Cambridge University with Wordsworth and he looked after Raisley on his deathbed as he died of consumption.Other sons of Charles Calvert the elder and Frederick's uncles were Charles Calvert, Henry Calvert and Michael Pease Calvert, who were all painters.