Interest allowable expense on investment property

[carrs]

I have an investment property and my mum loaned me the balance of money I needed to buy the property. It's all set up like a proper mortgage over 25 years ie monthly repayments detailing principal and interest and you can see the payments going from my account to hers, There's also a formal loan agreement in place. Can I claim the interest the same as if I was borrowing from a bank.

Thanks for any help