Lender Requiring my dad be on title for mortgage

[Gurjot Grewal]

I graduated college a bit over a year ago. My credit score is 800+. But my credit lines aren't enough for this lender. So they are requiring I get my dad to co-sign and since its an investment he has to be on title as well. 

Im in Canada the property is in the US. The terms this lender is offering are substantially better than other lenders. I have to buy in my personal name as well with this lender. 

What kind of risk does this expose my dad to? 

My worry is if something happens is my dads primary residence at risk ?