Forged will submitted by Mother and Sisters

Dear All My father had made a Will in which we had clearly mentioned that gala in Mumbai Area will be mine after his death. This gala is not a part of Cooperative society but is formed as a Company where my father is share holder. In addition to the Will in the shares of the company we he had made me 50% joint holder and has also put me a nominee for his part of the share on his death with due process. The death of my father was sudden and at his native place due to which my sibling and mother managed to conceal all the related original property papers with only Xerox copies with me. Based on the said property documents my sister and mother created a handwritten will with no witness but with signature of my father indicating that the shares be transferred to her name. On submitting this Will Company Directors issued me a letter informing that since there are 2 conflicting Will hence directors cannot take a stand and hence the Will had to be probated. I do not want to go to Probate as being the nominee in my father shares the property had to be passed on to me as per company rule. The following points need to cleared 1) Is it possible for me that if i prove that the Will submitted by Mother and Sisters is not valid than that property will be passed on me by default as myself being a 50% share holder as well my self being a nominee. 2) Can i put up a FIR against by Mother and Sisters and arm-twist them to withdraw the case. 3) In case Point 2 is not proper can i lodge a Criminal or Civil Case against them and how much time will be required to get a verdict from court. 4) If the court ruling in my favor will it be binding on the Directors to pass on the said property in my name or will the Directors still insist to Probate my Will. Your advice is very much sought after. Thanks and Regards Sanjay Adbol