[1] He succeeded to the title on the death of his older brother Henry Joseph Tichborne, the 4th Baronet in 1743.
[2] Born in Tichborne in Hampshire in 1679, John Hermengil Tichborne was a younger son of Henry Tichborne, the 3rd Baronet, and Mary née Arundel (1622–1698),[3] the daughter of Charles Arundell, a younger brother of Thomas, Lord Arundell of Wardour, a Catholic family.
John Hermengil Tichborne was one of four sons and five daughters, four of whom died in infancy.
[4] These included: Henry Joseph Tichborne, the 4th baronet; John and Charles Tichborne, who both died young; Winifred, who died as an infant; Lettice, who married Henry Whettenhall and whose son, Henry, also became a Jesuit priest in Europe;[5] Mary, who became a nun; and Frances, who in 1694 married John Paston.
[2][8] Father Sir John Hermengil Tichborne died unmarried in Ghent in Belgium in 1748.