There is also an interesting account of this family in "The Bedside Book of Bastards" (Hardcover) by historian Dorothy M Johnson, who also wrote the stories on which the movies "Jeremiah Johnson" and "A Man Called Horse" were based. The book is out of print, I believe, but can still be found through Amazon.com
It's a collection of historical accounts of some of history's most notorious "badasses" (/grin), but told with a humorous twist and a sort of Paul Harvey "rest of the story" flair. It also makes a great coffee table book when priggish guests or relatives drop by!
Thanks, it sounds like a fun book!