Looking for Desendants of Cyril Moulton New Zealand

Cyril b +/- 1898 (my grandfather) was a merchant seaman prior to WWII, and relocated to New Zealand sometime in mid 1940's. I have a letter sent from NZ to my father Cyril F. in Vancouver, Canada dated 1961.
His first wife Harriet Tant died in England 1927. Any info would be great!