Tax implication and gift deed on marriage gifts of "car"

My marriage is scheduled on 17th jan 2019. My future "Father-in-Law" is wishing to gift me a car of worth Rs. 8 lakhs in my name on 31st Dec 2018. I am a tax payer for last 7 years.

i am receiving gift 18 days before my marriage. 

Whats will be Tax liabilities and formalities to prove that this gift received on occassion of marriage?