Thanks for your 2 items.
We have, then, that Alice married Nienkerk prior to 1943.
The 1911 Canada Census shows the family of Robert Nienkerk. I noticed Robert had a brother born in 1902. I found Otto Nienkerk buried at the Olney Cem. in Pendleton. http://www.findagrave.com/cgi-bin/fg.cgi?page=gr&GSln=ni...
It appears that Robert and Otto immigrated together from Canada. Robert landed at Prosser, and Otto in Pendleton.