Hi Carlingford
Just another thought.
Depending where they ended up, you may find infoormation in American or Canadian documents. I'm not sure what you have access to, either. Do you know their final, main destination? I know they may have spread out eventually.
I know the first thing my friend asked me to find out about her family, was what happened to her ggrandfather, and despite finding all sorts, it defeated us for years. She knew a couple of his daughters might have gone to Canada.
Out of the blue, one day on Ancestry Library, I found a death for him in Canada and got to view the certificate free.
I went on to find and get enough certificates (For free), to tell me that all of a large family apart from a couple we knew about had gone to Canada and evidence of most of their marriages and how they died. I still don't know about all of their children, and it depends where they went.
This was for Ontario Canada., which is particularly well covered, but there are loads of censuses and directories for Canada and USA, and immigration records.
If you tell us where, someone will probably help.
I would try findmypast.com though.
Best wishes
Emms
