John
If you have the correct lineage then you could try to contact the Gt. Granddaughter of William Jr.
She joined the I.O.M.F.H.S. in the northern summer of 1995 and requested information in the August Journal.
Subsequently in the the 21st Birthday special issue of the same journal in February 2000 (pages 26 to 29) she published an article about her findings.
Her email address at that time was rcase(AT)connected.bc.ca
Peter.
PS. Previously in May 1990 a Mr Lee J. Corkill of Los Angeles had shown interest.
Also of interest a certain Mr. B. (Brian) Lawson also of British Colombia joined the Society at the same time as Roberta.