Will

My father is the sole owner of the property. My father registered a Will ten years ago in favor of his sons when my mother was alive at Government Sub-Registrar office. Currently, my mother is not alive and my father was hospitalized for the treatment of blood clots in brain. My brothers influenced my father and executed a new Will without my knowledge. He was also under the influence of medicines (blood thinners for his brain clot) while registering the new Will. My brothers and father live in same State, I live in different State. My brothers could influence my father to execute another Will to equally distribute among themselves or sell property while my father is alive and distribute money among themselves without my knowledge. My brothers are keeping close eye on him and keeping under the influence so he cannot make any legal decisions without their knowledge which would impact them legally. Please advise what legal options do I have to stop them from registering another Will or Selling the property without my knowledge? Thank you and I appreciate for your time and willingness to share your legal advise. Thank you.