The executor of Dr. Norman Sarratt's estate is Michael Irwin, his grandson. Eighteen months ago I talked to him while he was going through his effects, and was able to send me a copy of the Sarratts' book. At that time he had a few copies left found in Norman Sarratt's house. He may know of any genealogical research surviving.
My last contact was through his e-mail address, mike@relgyro.Stanford.edu.