He was the grandfather of American musician Billy Joel and British conductor Alexander Joel, who are half-brothers.
hiː wʌzðə ɡɹˈændfɑːðɚɹ ʌv ɐmˈɛɹɪkən mjuːzˈɪʃən bˈɪli dʒˈoʊl ænd bɹˈɪɾɪʃ kəndˈʌktɚɹ ˌælɪɡzˈændɚ dʒˈoʊl, hˌuː ɑːɹ hˈæfbɹˈʌðɚz.