Thanks for the responses. A Dr. Carr (Kerr?) is mentioned in Letter 4, (1856) The Watts Hays Letters. It isn't clear from the letter whether he was in Jackson or Callaway Co., MO and I have not identified him yet. This was pre-Civil War so is just an explaination of my interest in the Kerr's. That the Kerr brothers of Jackson Co. rode with Quantrill is also interesting because it adds then to my list of guerillas who were related in some way to Margaret and Upton Hays and there were quite a few, at least 8 so far, that makes 11 with the Kerrs. Margaret's Uncle James B. Yager was also her mother's cousin.
I think that the relationships between the guerillas that Don Johnson noted and the discussions on this board of the type of men who became guerillas early in the War - sons of the people of property and position - was a major factor in their success and persistence in resisting the Union forces. They had, as a group, an internal cohesiveness based on family and social relationships and a common cause. It is puzzling to me how an 'outsider' like Wm. Quantrill came to be a leader of this group. Why didn't they choose one of their own?