Income tax

Owner or a co-owner of a house property may claim deduction for interest on home loan. 

But the AO may accept a document in which the owner is declaring that he/she does not have any income and therefore the EMI shall be paid by the son, and request to allow him to claim deduction for interest. 

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Punit, if you are a joint borrower in the loan, interest certificate issued by the bank will carry your name also as borrower. in this scenario you claim interst deduction for tax benefit.

if the loan is only inyour mother name sheould be having a source on income. she should claim tax benefit.