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
Notes about the census: Right above James in the 1860 census is a listing for John Dysart. This is likely an older brother. Compare age for John (41) and James (35). Something to look out for when I look for their parents. Also a teamster is like a truck driver but with a wagon and a team of horses. This was during the gold rush and the fever was particularly strong in this county at that time so that could be related, or not.
Death
In the 1880 census, Louisa is listed as a widow. Therefore, James died between 1870 and 1880.