How to resolve property dispute between 3 Siblings

I am the eldest daughter in a family of three daughters. All of us are married and settled. My mother had written her will stating that the ancestral house (which was passed down to her from her mother) which bears my name and half acre of land to be passed on to me after her death. This was agreed upon by everyone including my father too. The other 2 daughters were asked if they want a share but declined. They were given a good amount of land equally well before my mother's death which they sold now. I was not given anything since I was always told that the house and the land belonged to me. A year ago my father said he wanted to go back to our hometown. Once there, he modified the will and split the property but hasnt completed the registration yet. Apparently there was a clause in the original will that my mother signed which stated that my father can change the will if required. Is there anything that I can do here to get back what was originally given to me by my mother?