I think this person may be assigned to the wrong parents.
Grave headstone in Happy Valley cemetery is very eroded and difficult to read so I think estimated age 30 is a mistake.
British newspaper archives has the following articles:
25 April 1865 at Hong Kong, Birth of a daughter to F.I. Hazeland, Crown Solicitor, Hong Kong.
26 Nov 1866 death at Hong Kong, Margaretta Anna, only daughter and youngest child of F.I. Hazeland, Crown Solicitor, Hong Kong.
See the following person: Margaretta Anna Hazeland
https://books.google.com/books?id=iaZMzPuLAggC&lpg=PA389&ot...
His mother and daughter had the same name.
I hadn't sorted out all the Hazelands. Thought I'd put what I saw and hope someone like you could help sort it out later.
Vaudine England · 1998 · Biography & Autobiography
His letters also mention 'my old girlfriend, Rheta Hazeland'. She was the eldest daughter of Ernest Manning Hazeland of Hong Kong, himself the seventh son of a police magistrate.12 Her father was a civil engineer ...