The youngest, Thomas "Tad" Lincoln, was born on April 4, 1853, and survived his father but died of heart failure at age 18 on July 16, 1871.
ðə jˈʌŋɡɪst, tˈɑːməs "tˈæd" lˈɪŋkən, wʌz bˈɔːɹn ˌɔn ˈeɪpɹəl fˈoːɹ, wˈʌn θˈaʊzənd ˈeɪthˈʌndɹɪd fˈɪfti θɹˈiː, ænd sɚvˈaɪvd hɪz fˈɑːðɚ bˌʌt dˈaɪd ʌv hˈɑːɹt fˈeɪlɪɹ æɾ ˈeɪdʒ ˈeɪtiːn ˌɔn dʒuːlˈaɪ sˈɪkstiːn, wˈʌn θˈaʊzənd ˈeɪthˈʌndɹɪd sˈɛvənti wˈʌn.