Hi
Perhaps he had a son b. around 1848 who maintained the same street address as his parents in later life? This news item says father Captain.
Deaths
... 16th, 1930, unexpectedly whilst on holiday at his son's residence at Filey, of 3, Clifton Avenue, West Hartlepool, the son of the late Captain and Mrs. John Dunbavand, a Bridgewater Street, Runcorn, in his 82nd year, headmaster of the West.
Published- Friday 01 August 1930
Newspaper-Runcorn Weekly News
County- Cheshire, England
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GENERAL NEWS
DEATHS. DUNBATAND.—October 30th, at 15. Bridgewater-A.. Eliza, the beloved wife of John Dunbavand
Newspaper- Runcorn Examiner
County- Cheshire, England
I do not know what census you mention, but I see a man who may be correct in 1891. He lives with his wife Eliza at 9 Bridgewater street Runcorn. He is a mariner aged 67. A grandson aged 27 is with them. Named John and also a mariner.
Not sure this is of help or not.
Sue