Mortgage interest for foreign property and principal property

Hi,

 

The situation is this:

1. I have a property which I own under my name in the US (Seattle) and live in. This is my principal residence.

2. I have a property in Canada which is under my mom's name, BUT I am the guarantor for the property. This home is the principal residence for my mom. 

 

Question: Can I write off the mortgage interest and property taxes on BOTH the properties? If so, how do I go about doing so.