Gifted Property

My Christian Father and Mother 23 years back(1995), at their age of 66 and 58 Gifted me a land Purchased and Owned by them in 1977 . The Land was registered in Register office(1995) in Kerala ,as a gift by Parents to me out of Love and consideration . I am not sure if any other procedures of Gifting a land was to be effected . Being an NRI , Though irregular , I used to pay Tax for the Land and last was paid even Last month . My Parents passed away few months back at age of 88 and 80, without a will to our Knowledge .They had a undivided property of 30 cents , which according to me, shall be equally Divided among 3 brothers . Now , one of my Brothers , threatens that he will not allow for equal parts partition and instead file case attaching the Gifted property as well saying that he had Rights in that Property . He may perhaps cite that a Gift deed Procedure was not followed while registering the gift . Is it necessary to have a Deed other than Registration of Land Document ? Is it Necessary to have an Acceptance of Gift from my end ,apart from the registration ,for the gift to be legal ? If He files a case , can I get it Quashed in the Trial Court itself without further chance of appeal ? Can he attach the gifted Property for a case to claim his share beyond the Property left out by my Parents without will ? Will it effect transactions or Usage of my Property received as gift until the Case is heard and Judgement issued by a Competent court ?