None of you are getting what I mean, or how I see it. I'll see if I can simplify where i'm coming from with an example.

Electrolux (the Company, parent is Swedish) in Australia produce (or have produced) and own various brands like Westinghouse, Simpson, Chef, Kelvinator etc. Some were Australian brands, others not. They now produce (or until recently produced) Electrolux branded stuff alongside others like Simpson, Westinghouse etc. Many of the products have been identical but with different looking externals eg Simpson dishwashers and washing machines were the budget and Westinghouse the more sophisticated looking. So because the Company is called Electrolux and they sell Electrolux branded stuff which is actually identical (but a different face) to the Westinghouse banded product does the Westinghouse product automatically become "an Electrolux"? Lets say they released an upmarket version branded ESW (acronym for Electrolux Special Whitegoods) which was identical to an Electrolux but had more features, a higher efficiency and more powerful motor and had all sorts of cr@p hanging off the outside. It was marketed, sold, serviced and warranted through unique channels. Does it become an "Electrolux"? To some people it might be. To me it is a different brand. No different to Lexus sticking a 5.7L V8 into a 200 series Landcruiser, tarting it up and branding it as a luxury higher performance and more expensive version of essentially the same thing, but called a Lexus LX570.

Same with GMC (which I think is General Motors Company) trucks. These were at times sold alongside Pontiac vehicles at Pontiac dealers to give the Pontiac division of GMH a full range of vehicles to allow them to compete with Chevrolet. They were essentially an "upmarket" version of the same thing in the Chevrolet range, often how a Pontiac was seen except many GMC's were really just a Chev with "shinier" bits on it. So because both brands (GMC Trucks and (General Motors) Chevrolet) are a GM brand does the GMC automatically get seen as a Chevrolet? Or vice versa, the Chevy as a GMC? They are far closer together than a Holden and a HSV.

Just my take on it anyway.