prove it. anyways who cares, that's a pretty tiny number.
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To prove what? That she is anti-Russian?  Well, first she is anti- Russia because she tried  to blame Russia for exposing her lies. I understand it is a trend nowadays in Northern America- to blame Russia for everything but in this case she is paying for her LIES. Dose not matter who exposed it. 
As you can see in this article 
 http://ottawacitizen.com/news/national/defence-watch/chrystia-freelands-granddad-was-indeed-a-nazi-collaborator-so-much-for-russian-disinformation
 it is not Russia or the Russian. 

About tiny number of Russian immigrants and born Canadians with Russian decent- you are right it is a tiny number in Canada. But in comparison to the Galicians of the after the WWII wave of immigration, they do not support Bandera , their ancestors fought with Canada against Nazi (and Banderists), and being obviously on the side of Banderists (this she never hid) Freeland could not be in the government.