He's my 2nd-great uncle, my great-grandfather's brother. I had been assuming that his legal name was John, because that was his father's name (according to his death certificate), but Heather did a search and found a James L Rogers - and all the information (parents birth places, wife's name, birth place, everything) matched perfectly. You couldn't find a better match.
So then I went crazy on Ancestry. I use Ancestry as a starting point, especially since I see flaws on there all the time (today I read my grandmother is dead - pretty sure she isn't, I talked to her yesterday and she sounded fine). I put together a tree, and then print it, finding other sources to verify the facts. The only tree I trust on there is my cousin's, because I know the information on that tree is from family records in his possession.
Over the next week I'm going to work on JL's mother, who was named after her father - Willis. Her full name was Willis Adeline/Adaline Weed, nicknamed Addie. She was the only child to two older parents (I'm presuming miracle baby/accident or adopted). All I have is her parents names - Willis Weed (Willie Weed?) and Martha Clay.
I also found my two 2nd-great aunts married the same man. First one sister did, then she died, then the other sister married him a year later. I find this remarkably creepy for so many reasons. I'm sure it was common, but still, I shudder at the thought.