I'm not sure if I used the right words to explain this. In the example I used, the Root users would belong and inherit all the permissions of the Gadget Group, but those who are members of Gadget would not inherit Root permissions. If multiple groups are added to Gadget, they do not inherit each others permissions. They only inherit the permissions of the group to which they are added.

So the relationship is the other direction. ug_grp_id inherits the rights of ug_main_grp_id.

Thanks