Gift to or from parents is taxable?

Dear Professionals,

I have few questions on Gifts within Relatives.

1. If a major/independent son proposes to gift Rs1,00,000/- to his mother. Is this gift taxable (if yes, to whom)?

2. Is there any cap on such gift amount and under which section this is covered?

3. What are the tax benifits for a gift to spouse or fiance?

Please help me in clarifying the above (if possible in detail with examples)

Thanks in Advance

Rama