Arms: Quarterly: 1st & 4th, Argent, on a Bend invected, plain cotised Gules, three Catherine Wheels Or, on a Chief Gules, three Leopard’s Faces Or (Hardy); 2nd & 3rd, Per pale Argent and Or, a Bend compony Azure and Gules, between two Pellets, each within an Annulet Sable (Gathorne). Crests: 1st: a Dexter Arm embowed in armour proper, garnished Or, entwined with a Branch of Oak Vert, charged with two Catherine Wheels Gules, one above and one below the elbow, the hand grasping a Dragon’s Head erased proper (Hardy); 2nd: in front of a Wolf’s Head erased Argent, a Staff raguly fesswise Or (Gathorne). Supporters: On either side a Leopard guardant proper, gorged with a Collar Gules, pendant therefrom an Escutcheon Gules charged with a Catherine Wheel Or.
Lord Cranbrook's eldest son, the second Earl, represented Rye, Mid Kent and Medway in the House of Commons as a Conservative. His son, the third Earl, was gazetted as an officer and private secretary New Zealand.
John David Gathorne-Hardy, 4th Earl of Cranbrook (who was previously married to his cousin Bridget D'Oyly Carte) married Fidelity Seebohm (born 1912), on 26 July 1932 and had five children, including Gathorne Gathorne-Hardy, 5th Earl of Cranbrook, the current earl.
Hon. Edward Gathorne-Hardy, second son of the third Earl, was a traveller, botanist and socialite who lived in Athens. He was famously eccentric and rumoured to have been in a relationship with Anthony Eden. Dorothy Milner Gathorne-Hardy, daughter of the third Earl, was the wife of Rupert D'Oyly Carte. Another member of the family was the writer Jonathan Gathorne-Hardy, a son of Hon. Anthony Gathorne-Hardy, youngest son of the third Earl.