Marriage
A Greene county, Missouri Marriage Index shows that James Dysart married Louisa Whitlock 11/25/1847. The ceremony was possibly performed by Minister C. C. Williamson.
Census
Whitlock Ancestors
This is a pdf of Louisa Whitlock's ancestors apparently written by Patricia and Rick Staats. (Obituary of Patricia Staats in 2008.) I have not personally confirmed any information in this document.