You said,,,,,,, Who did his grandson, William Arthur Kemp, marry (i.e. the son of William Hall Kemp)? I have his birth and death date and info up to the 1940 census but nothing more on him..
do you mean William Arthur Kemp born 1925 son of Arthur Hall Kemp
family tree on line of Harrison 551 has
William A Kemp
Birth 24 Apr 1924 in Seatle, Washington
Death 17 june 2004 in Portland, Oregon
married 2 daughters, 2 sons names held private
Arthur Hall wife was Edith or Edyth Southworth
Arthur and Edith also had a daughter Miscella 1920-1990
mrs William Gordon Simpson....3 girls 2 boys
I could pass your email on to them if you wish. I am NOT related