arcpy.Copy_management(in_data, out_data)
Usearcpy.Copy_management(in_data, out_data)
If you specify your featureclass as in_data, any related tables and relationship classes will be copied along with it.
Shazad Tareen, did you find a resolution to this? I'm having a similar issue... the feature class and the relationship is coming over, but not the table...
Dan