Do car companies even do "sister" cars anymore?
Sure! These are but just a few examples:
Chevy Malibu/Buick Regal
Chrysler 200/Dodge Avenger
Kia Optima/Hyundai Sonata
Ford Fusion/Lincoln MKZ (My current vehicle, the Mercury Milan, was also on the same platform, but, like the entire Mercury brand, went the way of the dodo bird after the 2011 model year. Damn shame, too, because I really like the looks and performance of my Milan, but Mercurys weren't selling too well in their twilight years.)