Look at this as three different parts.
1. Proof how you are related to your uncles
- Your Birth Certificate
- Your Father's Marriage Certificate (Showing Father Name, May be address is same, highlight other common things)
- Your Unlc's Marriage Certificate (Showing Father Name, May be address is same, highlight other common things)
- Any other proof which shows linkage from you and your father -> your unlce (ID Cards, etc...)
2. Proof Your Uncle is Canadian Citizen or PR of Canada
- Copy of Canadian Passport
- Copy of Landing Record or Copy of PR Card or any other Document
3. Proof that your Uncle is living in Canada
- Credit Card Statements showing spending in Canada (at least 6 months)
- Utility Bills of House in Canada
- Tax Returns
I hope this helps...
MJM