To be honest it was pretty light, I sent in a joint bank account, BC IDs showing our same addresses, employer benefits in both our names, and pay stubs. I didn't think I'd have to prove that hard being that we're married and not common law, but apparently that wasn't the case. The letter specifically wants documentation of cohabitation dated from the time of submission to today, so I imagine I'll just gather up the bills, ID, insurance stuff, and bank statements and throw it at them. I can't really provide anything like a rental agreement as I'm just living with my spouse in their family owned condo, but I suppose I could get his family to write letters saying that I'm with them.