Procedure for gift deed to transfer money to mother and brother

Hi, I'm planning to gift money Rs. 5 lakh each to my mother and brother through online transfer. Both the donor and donee are residents of Jharkhand. I'm aware that this is tax-exempt but to avoid any issues in future, particularly from Income Tax Dept, is it advisable to get a gift-deed registered? What should be the value of the stamp paper? Any other charges also involved in getting this document registered? Any other things that I should know about this transaction? Thank you