This was a tough one! Did your grandparents live in Edmonton, Alberta, Canada? The website ANCESTRY.COM doesn't have alot of Canadian records, but I did find some things.
There is record of the burial of LARS JOHNSON on August, 20, 1960 in the Beechmont Cemetery in Edmonton, buried in Block 0357, Plot 0002.
There is record of the burial of KATHLEEN JOHNSON on Oct. 5, 1938 in the Beechmont Cemetery, buried in Block 0134, Plot 0009.
Listed in the 1935 Edmonton Voter's Lists is:
LARS JOHNSON, prospector, boards at 10263 102nd Street.
Listed in the 1940 Edmonton Voter's Lists is:
LARS JOHNSON, prospector, 10265 Apt. 4
I spent quite a while trying to find something on your mother and father. The only thing I could find was a family tree on ANCESTRY.COM that listed a HERBERT MORRIS STEVENS, born Aug. 1, 1915 in Wingard, Saskatchewan, Canada, died July 1998 in Enderby, British Columbia.
Did your parents live in the states or in Canada? Could you tell me where your mother was born?
I was hoping to find more than this for you, but right now this is all I have. Hope it helps you. Sincerely, Melinda