I understand that if the value of the gifts to others exceeds ₹50000 is taxable in the hands of recipient and there will be no tax if the recipient is close relative and in this case son-in-law is a close relative to father-in-law. Please guide me.
There is no concept of Gift Tax now. The Gift Tax Act 1958, has been repealed ( cancelled / abolished ) in the year 1998. So Gifts are now subject to the Income Tax Act 1961. [ Section 56(2)(x) of the IT Act 1961 ].
And you are absolutely correct that if the Gifts / Property is received from any "RELATIVE", then it is exempt from Income Tax Act 1961. Sir you can refer the definition of Relative for this Section purpose U/s 56(2)(vii) of the Income Tax Act 1961.
NOTE : Gifts upto Rs. 50,000 p.a. are exempt from Income Tax in India.