This is actually a really important thing because lots of people think you inherit debts proportionally to what you get, but that's not really how it works. Basically, the deceased's debts are paid from the estate before you get your share. That means creditors (the bank, credit card companies, etc.) come first and take their cut from the property and money your father left behind. If the estate isn't enough to cover everything, the creditors just lose the missing money - they can't come after you personally if you accept the inheritance normally.
That said, there's an important exception: you can refuse the inheritance completely, or accept it "with benefit of inventory." That second option is really something you need to know about. It means you inherit your share, but you only pay the debts up to the limit of what you receive - you're not at risk for anything beyond that. It's a bit more complicated administratively but it protects your other assets.
Honestly, you should really consult a notary or an inheritance lawyer. Every situation can have nuances (was there a will, how are the properties registered, etc.), and this isn't the thing where you want to mess up. A good notary can also explain how the mortgage works - often the house itself can cover a good chunk of the debt.