Joshua can be found on the net, with the story of his time here.
Also, another ggggrandfather was named George Miller, and he was the second bishop named by Joseph Smith with the Mormons. After Smith's murder, George did not follow Brigham Young to Utah, choosing instead to head down to Texas with a splinter group of Mormons. By then he had four wives. He can also be found on google.
What great stories! It’s a shame Washington himself had no direct descendents—I’d LOVE to be able to claim him as an ancestor. He’s my favorite president (though Ronaldus Magnus runs a close second).