Manuel dos Passos father Cyril F. dos Passos was John's first cousin. (Their fathers were brothers). That would make Manuel John's 2nd cousin.
John Dos Passos died on September 28, 1970 at the age of 74.
John Dos Passos was born on January 14, 1896.
John Dos Passos was born on January 14, 1896 and died on September 28, 1970. John Dos Passos would have been 74 years old at the time of death or 116 years old today.