Goodness your certainly good at this! This is more than I ever expected, i will never be able to repay your kindness.
I have been looking for Bestey Petrie also. I noticed in an earlier census she spelled it Betsy. I did stumble on something. In 1850 there was an Elizabeth Petrie living with her parents Joseph and Sarah Petrie in Hammond, New York. I was wondering if Betsy was short for Elizabeth. The birth years don't match up, which i was concerned about, but apparently census info isn't always accurate since all of Lucy's census said she was born in Canada, when in fact she was born in Hammond. when i got time i was going to trace this Elizabeth and try to find out who she got married to.
I have had no luck finding Nicholas either, and i've tried different spellings.
thanks for the source information I appreciate it. I would love to spend some time at a family history center, but live in a really rural area.