Visiting Houston's Fiesta Week, Spain's Marquesa and Marques de Villaverde, the daughter and son-in-law of Francisco Franco, won themselves a place deep in the heart of Texans. The couple slipped into Western clothes for a society ball in their honor, where the marquesa delightedly hobnobbed with another dude, Astronaut Pete Conrad. It was not all play and no work. The marques, 44, a leading heart specialist, accepted an invitation from Dr. Michael DeBakey to observe him in a delicate—but ultimately successful—operation involving a ventricular bypass heart pump, one of DeBakey's pioneering devices.
For...