I remember looking into the rotary connection before and coming up empty. No solid proof or real leads. The link you gave says Paul Harris and Jean Thompson had no children so I think that is a dead end right there??
The couple never had children, and Jean often joined Harris during his travels to Rotary clubs worldwide. After Harris died, Jean briefly continued to live at Comely Bank. She later sold the house and, in 1955, returned to her native Edinburgh, where she died in 1963.
Didn't RPH say he took the name Rufus to honor his father on one occasion, SPR or on the thread? His real name is just Paul Harris. So the mystery continues. Don't forget his above top secret security clearance and Air Force background, 500 B bond deal with the Vatican, etc. When did he have time for getting married and having 3 kids? Taking on the Mafia, US Gov't, SEC and DTCC/CEDE are not typical actions for someone with a wife and 3 kids knowing he would be attacked and they also if push came to shove. A single guy with nothing to lose would have been the ideal pitchman for CSHD imo.