If it's a children's show, such as The Wiggles or Sesame Street Live, then yes. Usually all kids need a ticket to get in.
For all other events, it depends. Rules vary from venue to venue and from event to event, so your best bet is to search by venue at the top of any page on Ticketmaster.ca, click the venue name under "Location" and scan "Venue Information" on the right.
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