Source: https://www.canada.ca/en/immigration-refugees-citizenship/corporate/publications-manuals/operational-bulletins-manuals/permanent-residence/express-entry/applications-received-on-after-january-1-2016-completeness-check.html
Here’s the list of possible supporting documents:
“Document requirements
- This documentation is required if the applicant indicates that they, or their accompanying spouse or common-law partner, have a family member in Canada who is a permanent resident or a Canadian citizen.
- A copy of both sides of the family member's Canadian citizenship document, Canadian birth certificate and/or permanent resident card must be provided.
- Evidence that the family member currently resides in Canada must be provided (a residential lease, mortgage documents, utility bills, etc.).
- The documents must show their address in Canada and should be recent (dated within six months prior to submission).
- Proof of the relationship of the applicant or the accompanying spouse or common-law partner to the family member must also be provided (e.g., a birth certificate, an official document naming the applicant as a relative, a copy of the inside back cover of the relative’s passport showing the relative’s parents’ marriage certificate, legal adoption documents and any other documents that prove or describe the relationship).
- If the applicant claims a stepbrother or stepsister, there should be no evidence in the application that the marriage or common-law relationship between the parents of the stepbrother or stepsister has broken down.”
