Here's what I have on the family of Peter Jackson Vasser and Thankful King: Celia Vasser m. T. Guess Nathaniel B. Vasser m. Millicent Doss Samuel J. Vasser m. Fanny Vasser Joshua Vasser m. Nancy Summers Levi Vasser m. Margret L. Peter Jackson Vasser m. Matilda Hountz
Peter Jackson went by the name Jackson for a time, probably to get away from being called junior.His sister Celia and her husband and their children:Peter and Thankful, appear to have been living with him in 1850.
I have heard of Caswell Vassar, but the reference I crossed was in Virginia.Didn't pursue it though, sorry.
I'm not absolutely sure I'm even trailing the right Joshua.I find him listed as born in Claiborne and Cannon counties and also just TN. and his marriage to Nancy Summers,three choices there too.Claiborne and Cannon in TN and Cannon Co., MO, and I can't ind that one at all!!!