I posted to your other inquiries but in reading this message of yours , two questions come to mind:
1. How did a baby boy from Quebec get to NY? Does this not seem that there were some intermediaries to connect up dorothy to the rivets
2. do you know that dorothy was a resident of Canada? Maybe she came from NY to Canada to have the baby and there are sure a number of Dorothy Weinbergs on the SSDI that look like likely candidates.