I voted for 10M but I have the feeling anything above 5M ought to do.
For one, I don't intend to move out of Canada. Sure, with 5M, you could move to, say, Vietnam or Costa Rica, and live like a king. But, I have been to those places and, while I did enjoy my stay there, I can't envision living there for the rest of my life. Short stay, sure; long stay, hell no.
For argument sake, if I had some of the jackpot, say, 5M, I will give some to my parents and siblings. Fuck the rest of the family. From there, some cash to some close friends, specially those with kids. Basically, put $$$ for their kids education. Why friends and not other relatives? Because you can choose your friends but you can't choose your family. (Hey, that goes both ways!).
From there, get two to three detached houses - one to live, the others for investment/rent out. Maybe also a condo or two in the interior. Kelowna would be nice. Depending on how much is left, maybe open a chain restaurant of sorts. Say, a Timmys or Starbucks. Sure, they are not the fanciest but, for the most part, they are stable compared to a venture with a celebrity chef. As for the rest, keep some liquid and invest the rest, hopefully, to live my life with having to go back to work 9-5. So, yeah, in general, keep a low profile.