How to Take Interest deduction

I have taken Housing Loan,
property is joint with me and my mom, first name is my mom's name, second my name,

Bank has given loan, to my mother's name, which she is main holder property, and loan has been credited to SB account where it's is joint account, and for repayment bank has taken my ITR returns, and EMI will be debited from my SB account,

so please let me know how to take benefits of interest, under deductions
whether I can take fully deduction or 50 %...