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The PR card is not accepted as a Child Photo identification document.
Photocopy of two (2) pieces of personal identification.
Both pieces of identification should show the minor’s name and date of birth, one of which must have a photo on it.
Examples include:
school record;
health insurance card;
a passport page containing their photo and personal details;
a hospital or immunization record may be provided.
Note: If there is information on both sides of the identification document, photocopy both sides.
Source:
https://www.canada.ca/en/immigration-refugees-citizenship/services/application/application-forms-guides/guide-0003-application-canadian-citizenship-minors-under-18-years.html
Refer: Step 2 - Gather the minor’s documents