If you will Google "John Thomas wife Barbara Watts" you will get a few hits, including one which mentions a Watts will naming Joel's mother.
Also, this site mentions Joel's parents:
I am a D.A.R. member so I looked on the members' only site and did not find a John Thomas with wife Barbara, although there are several John Thomases from VA.This does not mean, though, that your John did not serve, only that no one has applied for D.A.R. membership through his service.