Pleased to make your acquaintence. I am a descendant of Thomas Gillham, Sr. from whom this line descends, I can give you a lot of information on earlier generations, although not too sure I can shed much light on Josiah K. also there is, I believe, a Josiah R., I can see, easily, how the two could be confused, but I think they are 2 distinct individuals.
I use FTM version 7.5 and have compiled a database of around 25,000 who are either descendants of or kin to descendants of Thomas Gillham, Sr.
I am located in Granite City, Illinois, just across the river from St. Louis, and would enjoy having whatever you might be able to add to my database and would be happy to share any and all I have with you.
Should you wish to snail mail me, my address is 2700 Highway 67 (Missouri Ave.), Granite City, IL 62040-2029 If you have icq, i'm 68930089.