Your story sounds very interesting, something you couldn't have made up!
I don't think I have anything to offer at the moment but if you do find out the names of the children left behind with the Uncle then it should be relatively straight forwrd to find then and any descendants in the General registration and 1901 & 1911 census.
I should be able to help with the census as I am researching all Bary families listed in the two census. I'm interested to know about Barry families who emigrated so are there any naturalisation documents to help? Do you have a tree or GEDCOM, as I'd be interested to look at what you have?