Whoa Nellie, pregnant, about to give birth and they leave and go to a foreign country in 1916? That's absolutely preposterous. A pregnant woman wouldn't travel when she is about to give birth!
Just ask any troll, they'll tell ya.
The story is from Centralia, Washington. Perhaps the parents lived near the border and had gone to Vancouver or some other place just across the border—the traveling may not have been a very long distance. If the 95-year-old man has relatives in Canada, perhaps his parents were visiting relatives there then.