I know I have been to your home I know what kind of setup you have. But you can be issued forms from the tribunal for messing with someones free use of there home.
That is a good section to read.
Here are some ways
Here are quotes from the site...
Can a tenant be evicted for something that their roommate or a guest they allow into the rental unit does
Yes, a number of the reasons for eviction are based on problems caused by an occupant of the unit (someone that the tenant lets live with them), or a guest that the tenant lets into their building. So, for example, if a tenant?s guest punches a hole in the hallway wall, the landlord could give the tenant a notice of termination and, if the problem isn?t resolved, make an application to the Board to evict the tenant.
Can a tenant be evicted for having a roommate?
No, a tenant cannot be evicted simply for having a roommate. However, a tenant may be evicted if the roommate is causing a problem for the landlord or for other tenants. For example, if the roommate is making a lot of noise, damaging the unit, or there are too many roommates (overcrowding), the landlord can serve a notice of termination and apply to evict the tenant and any other occupants of the unit.
Also about the mail you are harassing and interfering with the reasonable enjoyment of the unit. That is a form 2. Also you admitted it to both of them. That could be bad news. If they find out you did it again. Cause then it shows intent and messing with postal services in Canada is criminal offense and one that could go against you in a tribunal.
I am sorry to tell you all this. I had to do the same with my sister. She rented out her basement apt and she had some idiots. All you can do is follow whats there. Don't get into conflicts with them for any reason. Keep everything professional and document everything they do wrong and serve them notices under the tribunal laws on the site I gave you.