Socloseyetsofar said:
That was part of one of my previous questions... how can we establish common law if we are both required to maintain a US/CDN home address while visiting each others countries? and if somehow we managed to do this how do we prove common law relationship without being on each others leases? I own my home here in canada and live with my father so it would basically be my word while he rents in the US
as stated above, you can apply to extend your stays (at least in canada you can). try googling "extend your stay in canada" or search for "extending stay" on the IRCC website.
there are many ways to prove residency without a lease/mortgage
1) letters/affidavids from people who know you are living together and can attest to how long you have been living there
2) showing mail delivered to each of you at the same address
3) driver's licenses in the same address (in ontario, a visitor can obtain a driver's license)
4) proof the canadian citizen changed their status to commonlaw with the CRA
5) putting bills in each of your names and showing proof of address from that (if both names can't be on the same bill, then split the bills up)
many people do this successfully.