I think you better have a letter from your landlord. The letter will be significant to prove that you have been living together for more than a year.
I got PR as a common law partner of a canadian resident. I submitted the letter from landlord...because my partner moved into my apartment and the rental contract had only my name. Also, I talked to the landlord to add my partner¡Çs name on the contract when we decided to apply for my PR status.
Rather than that, i sent lots of pictures, letters, Birthday cards, ferry ticket when we went trip to victoria...and letter from the back to prove our joint account. 6 letters from our mutual friends....i hope those info would help you.
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