This family repeated names, which causes confusion. Numbers and dates help to tell them apart:
#1 James Oswald Clazey (1819-1888) was a school teacher, later worked as a shipbuilder; married Ellen Craig, lived at Sunderland, England, died there in 1888.
#2 James Oswald Clazey (1850-?) was born at Carmel, New York, a nephew of #1 above; returned to live at Sunderland, England; became a school teacher; married Charlotte Gray; went to Australia in 1885, then disappeared; in 1897 an English court declared that he was presumed to be dead. His wife / widow remarried in 1915.
#3 Oswald Clazey (1878-1961) was a son of #2, lived in Northumberland, England, later migrated to New York, married three times, to Mary Ann Donaldson, Adeline Buckley, Elizabeth Wilkes, lived at Rochester, New York, died in 1961.
#4 Oswald Clazey (1900-1957) was a son of #3, born at Sunderland, England, lived at Rochester, New York; married twice, to Elizabeth Hirsch, then Harmony Schlotzer; died 1957 in New Jersey.
The mystery concerns #2, who disappeared around 1885: can he now be found?