Elder brother not willing to sign gift deed nor release deed

Our father had a land which he received from his father through Deed of Settlement and he entered into a JDA. We are reviving 6 flats in return for this JDA.My father wants to do a Gift deed in favor of me and my elder brother for this 6 flats (3 each).But the relation with my elder brother turned very bad and now he is saying that he will neither sign the Gift deed nor any Release deed in favor of me. What can we do now so that he can't claim share later (after father passes away) and my father and I can sell our share flats independently.