Henry Cavendish waxa uu ku dhashay 10kii Oktoobar 1731kii magaalada Nice, halkaas oo ay qoyskiisu ku noolaayeen waqtigaas. Hooyadiis waxay ahayd Lady Anne de Grey, gabadha afaraad ee Henry Grey, 1aad Duke of Kent, aabihiis wuxuu ahaa Lord Charles Cavendish, wiilkii saddexaad ee William Cavendish, 2aad Duke of Devonshire. Qoyska ayaa soo raacay siddeed qarni ilaa Norman times, waxayna si dhow ula xiriireen qoysas badan oo aristocratic ah oo ka tirsan Great Britain. Henry hooyadiis waxay dhimatay 1733, saddex bilood kadib dhalashadii wiilkeeda labaad, Frederick, iyo wax yar ka hor dhalashadii labaad ee Henry, oo ka tagtay Lord Charles Cavendish si uu u koriyo labadiisii wiil. Cavendish waxaa loo yaqaanay "The Honourable Henry Cavendish".
Sanadka 1748