Back in 2008, the Genealogy of Fort Worth's Architectural Firms was presented at an AIA Meeting. That chart has been published online. Almost all of the current architectural firms in the city are direct descendants of one of the firm variations of Marshall R. Sanguinet. Most of today's firms descended from Sanguinet & Staats, but a few came from some of the firms that he had with earlier partners. I think you will find the family tree interesting.
http://tcweb.tarrant...h-Genealogy.pdf