I did a little research on this yesterday and found out that your right about cancellations although if it weren't for you I wouldn't have been wiser.Talk to the airline about their policy.
I did buy return tickets myself (strange, but return ticket can be cheaper than a one way ticket), but my agent always made sure that it was the last flight(s) I was not taking.
Someone I know had to buy a new ticket as her reservation was cancelled when she just skiped one flight in her itinerary. There are a lot of stories about it in the internet https://www.google.ca/amp/s/www.thisismoney.co.uk/money/holidays/article-7003117/amp/No-way-airlines-cancel-return-ticket-miss-flight-out.html.
https://www.smartertravel.com/skipping-a-flight-onward/
People take airlines to court and win, but dealing with cancelled reservation at Borispol airport is the last thing someone going to Canada with 2 kids wants to do.
Definitely wouldn't like to find out last moment that the trips been canceled.
Oh well through Pearson or Trudeau shell go..well also save a few bob too.
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