This is a simplified version of which car companies own what brands, extracted from DigitalTrends.com article written by Thor Benson on November 14, 2013.
BMW (Mini, Rover, Rolls-Royce)
Chrysler (Dodge, Jeep)
Nissan (Infinity)
Fiat (Alfa Romeo, Lancia, Ferrari, Maserati)
Ford (Volvo, Mercury, Lincoln)
General Motors (Saturn, Chevrolet, Hummer, Cadillac, Saab, Holden, Opel, Vauxhall)
Honda (Accura)
Hyundai (Kia)
Honda (Accura)
Hyundai (Kia)
Mercedes-Benz (Mayback and Smart)
Toyota (Lexus, Daihastu, Scion)
Volkswagen (Porsche, Audi, Skoda, SEAT, Bugatti, Bentley, Lamborghini)
Rajeev's Curiosity 