Tax deductions on partial ownership

Hi all,

Just a quick question to point me in the right direction for research on this:

My wife and I live in a property which she partially owns with her father (she owns 5%, he owns 95%). We are paying standard market rent for the property but are wondering whether her father can claim against the interest paid on his 95% of the share, or does the father/daughter relationship or more importantly the fact that she is a tenant and a 5% part owner prevent him from claiming anything? Obviously she cannot claim her 5% interest, but can he claim his 95%?

Cheers,

Michael B.