I forgot to add "Hummer" to the GM list (not the H-1 -that was built by American General, but those "little" Hummers- H2, H3)Yes, Ford sold Aston Martin recently and rumors are brewing that Jaguar will be next. nearly 20 years of Ford ownership and the company still struggles. ugh.
Also, I believe Diamler is extracting itself from its 30+% ownership (control) of Mitsubishi motors (Mitsubishi is another one of those companies that does just about everything from Banking to heavy equipment)
Yes, Audi "owns" Lamborghini.. and VW owns Audi.
I would think it fairly safe to think that in the next 10-20 years there will only be 6 or so automakers (unless the Chinese explode and buy everyone out

) with various "brands" or "images" being marketed worldwide and 3 of them will own "half" the markets available.