Norman
The next step for you is to start a search for a marriage or death for either of these women. Not being really sure of where they settled in the USA makes it a bit more difficult but knowing their parents names and their approx birth years is a big help.
It might be a good idea to start a new thread on the US board that asks specifically for this informationon ... also, have you read checked the US Resources board at the top of US Main board, that might have some useful links to help you.
Cheers
Karenlee