co-signer

Good evening,

 

I'm hoping someone can provide guidance.  I co-signed on a house with my sister.  She pays the mortgage, i contribute nothing.  Do i have to add that 1098 on my taxes?  We agreed that I didn't want to split the numbers, she should get 100%. If i have to include her 1098 how would i go about doing that and showing $0? Thanks in advance.