Hi Kim
of the two brothers Edwin Charles and Edward both who appear to be in the navy on the 1861 census, I can only find Edwin Charles' Royal Navy record on The National Archives website.
Reference given in previous message.
Register's of Seaman's services
Name Webb, Edwin Charles
Place of Birth: Bath
Continuous Service Number: 12464
Date of Volunteering: 30 January 1854
26 July 1832 ADM 139/125
Name Webber alias Webb, Edwin Charles
Official Number: 62532
Place of Birth: Bath, Somerset
26 July 1832 ADM 188/42
Website reference
http://www.nationalarchives.gov.uk/documentsonline/power-search.asp?searchType=powersearchHowever Edwin can be found on the 1881 census and censuses after that date, but not Edward. So of the two brothers only Edward could be a candidate for the man who died in 1870.
Regards
Valda