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You're very wise to NOT accept things just told you, as true.....that's just not good enough for a real researcher. My genealogical guru once gave me the best advice I've ever gotten, genealogically speaking, and I pass it along to the gen. classes I occasionally teach - "Believe NOTHING you don't have the proof for, in your OWN HAND". That's advice all researchers should 'live by'! I think every researcher has at least one bunch of information floating around the web, on a family member, and no matter HOW many folks you ask about documentation, none has any.....it's like data takes on a life of it's own on the internet and it is impossible to track down anyone who has one bit of documentation.
In my own family, I was given a list of names, dates, events that had belonged to a family member who was planning to join the DAR....it was frustrating for me to see WHAT but have no idea of WHERE....and, while the majority of her data I was able to prove correct, there WERE several provable errors, so I couldn't simply accept ANYTHING she noted...where there were 2 errors, couldn't there be 3? So, the stuff on Isaac might not have been correct while much other of her data was.....
Good luck with your Joseph.