Rights of son to speak for mother

I am living in U.S.A. along with my mother. My mother is holding shares in Indian company in Karnataka. There are ten shareholders in the company. All of the shareholders are family members. The three Board Members are her brothers. Ten years ago, the family had agreed amongst themselves to settle outgoing shareholders for 5 Crores each by selling some of the property. Up till now, she her sisters have not received anything. We feel that the brothers are cheating. They are claiming that Urban Development Assoc is demanding bribery for property separation (Kathaa). Many of the shareholders are elderly/frail and afraid to speak out. One of the brothers tries to intimidate with threats of suicide, shouting, etc. Other brothers feel sympathy and tolerate this misconduct. Brothers flat projects are all sustaining losses They are ignoring all our queries. I wish to come to India and file complaints with Company Board of Registrar, Urban Development, Corruption Complaints, Income Tax and other relevant agencies . But I am not a shareholder. What is the easiest and quickest way for me to gain right to speak? Should my mother draft a power of attorney that I have right to speak? Some have told me that I need to request Company Board to deliver her physical share certificates. And then she can transfer shares to my name.If she makes this request, does the Board have to follow her wishes and mail physical shares immediately? We are afraid they will simply keep on delaying.