Hi rohan.budhiraja,
Can you provide clarification on your situation? You state you have a 'cousin sister' in Canada. If the person a cousin, or a sister? You can't claim the sibling points for a cousin, only for a biological/adopted/half/step brother or sister as outlined by IRCC.
If this person is in fact a biological/adopted/half/step sister of yours, you will need to provide the following:
- Proof of Sibling’s PR/Citizenship Status: Scan of Birth Certificate or Passport Bio Page (if she's a citizen), or scan of back and front of PR Cards (if she's a permanent resident)
- Proof of your Sibling Relationship: Scans of both of your birth certificates (yours and your sibling's), both showing the name of a shared parent
- Proof of your Sibling’s Physical Residence in Canada: A rental agreement, utility bills with your sibling’s Canadian address on them, bank account or credit card statements with your sibling’s Canadian address, and/or phone bills with your sibling’s Canadian address on them. (It’s a good idea to submit more than one of these documents, so that the 2nd can corroborate the 1st, and they should ideally be dated within the last 6 months.)