He was a son of
William Horneck and a grandson of
Anthony Horneck. He married Hannah Muggles (1727–1803) from Devon and they had issue: • Catherine (1750–1799); married satirist
Henry William Bunbury • Mary (1753–1840); in 1770 traveled to France with
Oliver Goldsmith and his family, to whom she was introduced by Joshua Reynolds; married Colonel Francis Edward Gwyn in 1778 He was close friends with
Edmund Burke, who on Kane's death became his daughters' guardian. Just before his death Horneck had inspected the defences of
Antigua - after his death his friend and fellow engineer officer
Leonard Smelt worked up Horneck's sketches and memoranda into a full report. Hannah was also a friend of
Samuel Johnson and
Joshua Reynolds, who painted Hannah and both her daughters. ==References==