kˈævəndˌɪʃ wʌzðə θˈɜːd sˈʌn ʌv wˈɪljəm kˈævəndˌɪʃ, fˈɜːst dˈuːk ʌv dˈɛvənʃɚɹ ʌv tʃˈætswɜːθ hˈaʊs, mˈɛmbɚɹ ʌvðə hˈaʊs ʌv kˈævəndˌɪʃ, ænd hɪz wˈaɪf lˈeɪdi mˈɛɹi bˈʌtlɚ, dˈɔːɾɚɹ ʌv dʒˈeɪmz bˈʌtlɚ, fˈɜːst dˈuːk ʌv ˈɔːɹmɑːnd ʌv kɪlkˈɛni kˈæsəl, mˈɛmbɚɹ ʌvðə bˈʌtlɚ dˈaɪnɐsti.
Cavendish was the third son of William Cavendish, 1st Duke of Devonshire of Chatsworth House, member of the House of Cavendish, and his wife Lady Mary Butler, daughter of James Butler, 1st Duke of Ormonde of Kilkenny Castle, member of the Butler Dynasty.