Interesting: as far as I know, Dishman was owned by the Waltermire family. They also owned a Honda/Acura (I think) dealership east of the 7700 address on Sprague.
There was a divorce, and the wife got Dishman, the husband got the Honda/Acura or whatever. I've forgotten their first names, but the son, Mark, was Dishman's GM.
I worked there 2005-2010. Not a pleasant experience, but that's another story...
I think Downtown Dodge may have been a separate/unrelated dealership; there was also a Chrysler/Plymouth dealership a bit west of Dishman, but they closed years ago.