Not sure if this has been covered before, but I thought I'd ask anyway!

What stories have been passed down through your family history, and have you been able to disprove/prove any of them?
There's a few in my family. The biggest one, which I have been able to disprove (unfortunately) was that there was a direct link to Napoleon Bonaparte. Others include , an ancestor helped deliver Charles Dickens, and that the house he was reputed to have been born in, actually wasn't. That's because where he was really born was in a very dodgy area of Portsmouth. I've yet to look into this, but I do know that my G. G. Grandfather sold a lot of Dickens first editions when he emigrated to Canada. Another one is that the same grandfather knew Conan Doyle very well. Apparently when Conan Doyle was a penniless Dr in Portsmouth my grandfather, who was a master joiner, built a load of cabinets for him in return for some medical treatments. They supposedly became friends and my grandfather used to be shown early versions of the Sherlock Holmes stories. I have investigated this, to the extent of reading Conan Doyle's autobiography. It does mention that he used to barter his trade for local goods, so there might be an element of truth to this story, but it doesn't mention my grandfather by name.
I've got a few others as well, but finding out if they're true is another matter. How have all of you gone about proving or disproving your stories?