For those lucky ones who get the PGP 2020 invitation to apply, please read the guides. Some of the form even have their own guides on top of the inline instructions in the form, so please read everything in detail. Last thing you want is to have your application returned as incomplete.What all documents are required ?
https://www.canada.ca/en/immigration-refugees-citizenship/services/application/application-forms-guides/guide-5772-application-sponsor-parents-grandparents.html
This link jump to the section about gathering documents for sponsor and for applicant:
https://www.canada.ca/en/immigration-refugees-citizenship/services/application/application-forms-guides/guide-5772-application-sponsor-parents-grandparents.html#gather