hɪz ɡɹˈændfɑːðɚ wʌzðə pɹˈɑːmɪnənt lˈɔɪɚ sˌɜː dʒˈeɪmz mˈænsfiːld, səlˈɪsɪɾɚ dʒˈɛnɚɹəl fɹʌm wˈʌn θˈaʊzənd sˈɛvənhˈʌndɹɪd ˈeɪɾi tə wˈʌn θˈaʊzənd sˈɛvənhˈʌndɹɪd ˈeɪɾi tˈuː ænd ɪn wˈʌn θˈaʊzənd sˈɛvənhˈʌndɹɪd ˈeɪɾi θɹˈiː ænd tʃˈiːf dʒˈʌstɪs ʌvðə kˈɑːmən plˈiːz fɹʌm wˈʌn θˈaʊzənd ˈeɪthˈʌndɹɪd fˈoːɹ tə wˈʌn θˈaʊzənd ˈeɪthˈʌndɹɪd fˈoːɹtiːn.
His grandfather was the prominent lawyer Sir James Mansfield, Solicitor General from 1780 to 1782 and in 1783 and Chief Justice of the Common Pleas from 1804 to 1814.