ɪn ˈeɪpɹəl wˈʌn θˈaʊzənd ˈeɪthˈʌndɹɪd fˈɪfti nˈaɪn, jˈuːstiz wʌz mˈæɹid tə luːwˈiːz mˈɔːɹɪs kˈɔːɹkoːɹən wˈʌn θˈaʊzənd ˈeɪthˈʌndɹɪd θˈɜːɾi ˈeɪt wˈʌn θˈaʊzənd ˈeɪthˈʌndɹɪd sˈɪksti sˈɛvən, ðɪ ˈoʊnli sɚvˈaɪvɪŋ dˈɔːɾɚɹ ʌv luːwˈiːz nˈeɪ mˈɔːɹɪs kˈɔːɹkoːɹən ænd wˈɪljəm wˈɪlsən kˈɔːɹkoːɹən, ɐ bˈæŋkɚ ænd fɪlˈænθɹəpˌɪst hˌuː kˈoʊfˈaʊndᵻd ðə ɹˈɪɡz bˈæŋk.
In April 1859, Eustis was married to Louise Morris Corcoran (1838–1867), the only surviving daughter of Louise (née Morris) Corcoran and William Wilson Corcoran, a banker and philanthropist who co-founded the Riggs Bank.