Hi TracyW,
Thank you so much for devoting time to research on my behalf.
I had been working on a somewhat similar strategy by starting on the UK Census for 1881, backwards to1871. It was thus I ascertained that Christopher's father's name was Thomas Johnston (born in 1835); his mother's name was Dorothy Ann Johnston (born in 1842). The couple had 7 children (Jane E., Thomas, James H., Dora A., Christopher, and Ethel M. Johnston). The family's address was 28 Trinity St - Chirton (North Shields). Mr. Tomas Johnston (head of household) was listed as a Steamship Owner. His sons Thomas & Christopher (I don't know about James H.), must have followed in his footsteps because they were both subsequently listed as "Mariner Seas" and "Steam Engine Maker Fitter" for Thomas and Christopher respectively.
In the 1901 Census there are listings for Christopher (then 33 years old), as having married Sarah C. Johnston of the same age; by that time there were 3 children, all girls, Lily (9y), Ethel (6y) and Alice Y. (3y), all living at 54 Lawson St - Chirton.
I read with great interest your account of how your gt-gt-grandfather got started in the fishing boat business. No doubt the entire area from Sunderland, through South Shields, to North Shields and beyond, in that era was thriving with activity, especially those businesses relating to the sea, or devoted to shipbuilding, ship repair/maintenance, etc. Have you been able to trace his descendants and what were their occupations since?
Once again, many thanks for your recommenations, your interest and assistance.