Kindly read this these are the requirements for proof of relation.
Dear Applicant,
Your application for permanent residence has been reviewed and the documents marked below are required.
An immigration officer will assess your application 60 days from the date of this email. The officer will make the decision to approve it, refuse it or call you for interview based on the documents and information contained in your application at the time of assessment. It is in your interest to submit the requested documents within 60 days. If you have not provided adequate information at the time of the officer's assessment, your application may be refused. You will be notified in writing of the officer's decision. Please do not send scanned copies of the documents via email.
If your documents are not written in either English or French, please enclose a certified translation with a photocopy of the original document. All documents submitted in support of your application are subject to verification with the issuing authority. Please allow four months for us to review incoming correspondence; please do not contact us unless there are significant issues which need to be brought to our attention. Please quote your file number on your submission and again on the top left hand corner of the envelope. Your file number is included in the subject field of this email.
Proof of relationship to your relative living in Canada and evidence that your relative is living in Canada:
Provide official, objective, legible documentation to prove that you are related to your relative. Documents should include birth certificates and marriage certificates. The certificates must state the parents' full names. You must provide certificates for each person that links you to your relative. All documentation must predate your application. Affidavits prepared for the purpose of your application will not be considered conclusive evidence of your relationship.
Provide proof that your relative is living in Canada now. This should include: payslips issued to your relative by their employer in Canada, Canadian income tax documents (recent Notice of Assessment), credit card and bank account statements in your relative's name showing transactions that occurred in Canada. We will not accept utility bills, telephone bills and property ownership documents as conclusive evidence that your relative is living in Canada.
You must forward all requested documents together to the address below within 60 days of the date of this email. You will not receive any additional requests or reminders.
Yours sincerely,
CKL
Immigration Section/Service d'immigration
High Commission of Canada/Haut-commisariat du Canada
1 Grosvenor Square
London W1K 4AB/Londres W1K 4AB
United Kingdom/Royaume-Uni
Government of Canada/Gouvernement du Canada