Somerset Family Search

SWMLAC is the regional development agency for museums, libraries and archives, covering the counties of Cornwall, Devon, Dorset, Gloucestershire, Somerset and Wiltshire, the unitary authorities of Bath & North East Somerset, Borough of Poole, Bournemouth, Bristol, North Somerset, Plymouth, South Gloucestershire, Swindon and Torbay, together with the Isles of Scilly and the Channel Islands.
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I am trying to find any information on

Ernest Arthur Clatworthy bn Somerset 1880

Ernest went to China in 1904.

He died in San Francisco, USA in Dec 1918 (Spanish Flu) 13 days after arriving in the city, his wife Estelle bn 1876 died 1 day before him.

Estelle Morrison bn 1876 in Clinton, Illinos.
Father Joseph Morrison,
Mother Mary Green, both from Ohio.

Did they have any children?
Why was he in China?
Suggestion where to look next.