Dart motors is a separate company from Rival Holdings, but it has "split custody" over Rival X Dart, hence the name. Rival Holdings owns the main Rival Motor Company and the RRA Alliance, which own the smaller companies of Rival Motors (makes the engines for some Rival cars), Reptile (imports Rival's cars) and Armageddon (makes large trucks). Then, owned by the Rival Motor Company are Primus (high-end supercars), Crestilno (rebadged junk) and Geändert (lower-end economy and sports cars). Then, we have Rival X Dart in space (self-explanatory), Rival Aviation (planes and some spaceships) and Rival Space Association (Makes spaceships) So yeah, that's the Rival family tree.
Will be updated as companies are created or purchased.
