Thank you, Rick, I will try that. And yes, I did start wondering about the accuracy of Burke's. I went so far as to become a member for 72 hours, just to make sure the Burke's posting still stands. It does, it's on their website. (I had found it on ancestry.com, but I don't trust much there.)
After all the time that has passed since Burke's published that biography, if there was a mistake in it, you'd think someone would have notified them. But perhaps all the people who knew are dead. This may be a little mystery I never solve. But I will pursue your tip.