Son of Nishijima Heigoro [西島平五郎] and Omori Chizu. Sanzo was born on the 19th day of the 6th month of the 4th year of Meiji (calculated to 5 August 1871). The date 19 June 1871 is given on his grave marker, a result of not converting his pre-1873 lunisolar birth date to its Gregorian equivalent.
"Hawaii, U.S., Marriage Certificates and Indexes, 1841-1944," database with images, Ancestry (https://www.ancestry.com/imageviewer/collections/61693/images/48933_i601859-00649 : accessed 15 March 2023), certificate image, Sanzo Nishijima and Muki Honda, 26 May 1911, no. 2630; citing Hawaii State Archives, Honolulu, Hawaii, United States.