Using what clues I can. I see William is born in Selby.
There is a George Lowther of Selby as follows...
RG10/4734 ED 9 f 107 p 8
Selby Yorkshire
St James Terrace
George Lowther 64 Head Mar Home & Land Agent Selby, Yorkshire
Grace Lowther 66 Wife Mar North Duffield, Yorkshire
George L Curtis 21 Great Nephew unmar Clerk to Home & Land Agent Selby, Yorkshire
Arthur Curtis 10 Great Nephew Selby, Yorkshire
Hannah Lazenby 23 Servant Drax, Yorkshire
It maybe worth trying to find this family in 1861 to see if George was then a mariner? There is no IGI I can see for William in Selby and a lot of 1837 births aren't registered. Best of luck with your search.

Pam
