Tax rebate on money sent home

I would like to know whether I can claim tax benifit on the money sent to my mother. I am working in a reputed MNC and have been sending money home everymonth to my mother after the death of my father.

So I have following queries related to this

1. Can I claim Tax benifit on the money sent home. If yes, under which section I can claim the benifit. My mother is homemaker and she doesn't have any other source of income apart from the money I have been sending.

Assuming I can claim tax benifit

2. What is the maximum tax benifit I can claim?

3. Does my mother has to pay any tax on the money she receives?

4. If the tax benifit is there will it be considered as a part of Rs 1 Lakhs which I can claim by investing in various tax saving schemes or it is a separate benifit?

Thanks and Regards