How to file taxes for a co-signed rental property

I have bought a house to rent out, but my parents had to co-sign in order to qualify for the loan. This process also put the on the title since the lender requests that. When filing taxes, who puts all the rent and expenses on their return. I've heard that since there are two parties on the title, it needs to be apportioned and filed with both parties tax return. Is this correct? Even though my parents have no intention of owning the house (they only co-signed to help me qualify, not to have a share in the house), do the rental income and expenses have to be apportioned and filed on both returns or can I do it all on my tax return?