No, a signed affidavit would not suffice. You would need other proofs such as mail, IDs registered there, bank statements etc.Davidef said:Here let me add: since October, in all sincerity, we have been basically staying together almost 24/ 7, due to the irreconcilable differences with my ex wife. However, the housing proof at the time was hindered by her the precariousness and unnecessary rigidity of her contract, which strongly affected us a couple. My question is: Would a co-signed affidavit suffice to prove we have been staying together since October 2015?
Also, could one renew an ETA from within Canada a bit before the expiry of the previous one ?
You can apply for a new eTA after the current one expires. Note that an eTA is merely permission to travel to Canada. If you are asking about staying in Canada, you would need to extend your visitor status.