George Dryden claims his mother had an affair with the former prime minister in the 1960s.
Dryden, who bears a strong resemblance to the leader, found out in June that the man he believed was his dad was not his biological father.
The Diefenbaker Canada Centre agreed to let a testing company from Thunder Bay, Ont., collect some DNA from items in its archives.
Dr. Amarjit (AHM'-ahr-jit) Chahal (SHAH'-hahl) of Warnex PRO-DNA Services says the samples will be tested within 10 working days.
But he cautions there may not be enough material to work with. (CKOM)