I just watched a very interesting interview with Matthew Hall, who is, of course, the son of Grayson and Sam Hall. The interview was conducted Melody Clark, who ran Grayson's fan club for many years and knew Grayson quite well. Matt is a very interesting guy who has some great stories to tell. For example, at one point, Sam, Grayson and Matt were all seeing the same therapist, Dr. Harold Kaplan. Kaplan was Nancy Barrett's husband. He also treated Phil Spector. I guess you can't win them all!
Matt also said that he has several file cabinets full of stuff about both his parents which he is in the process of digitalizing to eventually post of the internet. So there will some day be a mountain of Hall memorabilia that will seem brand new. He also mentioned that he still has Grayson's Magda wig.
The interview is posted on Melody's fan flak channel on YouTube. Probably other places as well.
Matt seemed to enjoy himself and agreed to come back for another interview at some point.