Procedure for tax exemption on interest under s/24

Hi everyone,,

I had taken a loan of 4 Lacs from my mother (through cheque) for purchasing a home in April-2013.. I have got the Occupancy Certificate for the house.. I have already claimed for the interest/principal exemptions based on the bank's loan statement.

I also want to claim the exemption on the interest, for the loan amount received for my mother.. I need help in understanding what legal documents are required to prove IT dept., that I have taken loan from my mother.. Please let me know the details, if any document needs to be prepared for this..

Regarding the payment of the loan amount, should I follow the plan, same as that with the bank (like treating fixed EMIs and calculating the total interest based on tenure/interest rate) or can I pay any lumpsum amount and treat a part of it as interest... This may look a bit naive, but please enlighten me.. )

Thanks a lot - Vaibhav