I'm not related but I did a quick search for you. This was the result that ancestry.com pumped out. I'm not sure if it is him but hope that helps - Regards Brad
Border Crossings: From U.S. to Canada, 1908-1935 about Clinton Donald Olson
Name: Clinton Donald Olson
Estimated Birth Year: abt 1917
Arrival Port: Sarnia, Ontario
Date of Arrival: 17 Aug 1931
Birth Location: Oak Park, Illinois
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Source Citation: Library and Archives Canada; 1908-1935 Border Entries; Roll: T-15377.
Ancestry.com. Border Crossings: From U.S. to Canada, 1908-1935 [database on-line]. Provo, UT, USA: Ancestry.com Operations Inc, 2008.