Jane and Thomas Snr did mrry in 1891, no mention of him being a widower. And they had son Thos Sutherland in 1891.
Jane Reid from Alford, had several illegitimate children before she married, one being my grandmother born iun 1894. There seem to be small gaps in between each child, so as James was born approx 1887, it is possible that he is the child of Jane and Thomas.
Thomas probably moved back to the Glasgow area, as he was a marine engineer and she probably followed him. I am only guessisng this of course.
Afteer Glasgow they moved back to Aberdeen where Jane died in 1906 and Thomas and Thos Jnr, and maybe James moved up to Peterhead, in 1906 and he remarried in 1906.
I had a peep at the 1921 England and it looks as if he is in Grimsby then.