I was able to get the relationshipClassNames property to work (thanks Xander!), but did not realize the relationshipClass property did not have a primary and foreign key field.
You may have been on one of the other threads where I posted this response, but incase you missed it, this functionality will be included in the 10.2.1 release via arcpy.Describe(<relclass>).OriginClassKeys and arcpy.Describe(<relclass>).DestinationClassKeys.