shirley1934smith, I'm afraid I cannot answer your question re the children, but my great-grandfather's family was much the same. My grandfather was his first child by his second "wife" (if she was his wife), but he never had any children with the first one but only stayed with her a few years.
I am still trying to find information either on their divorce or else confirm that there never was one, either way. Also, why did he abruptly leave the captaincy of a ship owned by his father, and then become captain of another ship from another country just before he left his wife moving to the USA? Very strange situation, with more questions than answers. :-(