property claim under illegal produced registered will

hi my name is savio, in the year 2014 my father had passed away after which it was bought to knowledge that there was a will made and also registered for nearly 4 years the will was not shown to my mother and me but on the basis of the will the stepbrothers had taken complete control of the property the will states that my mother would not get any share of the property and that I have been allotted the roof top as my share of property which can't be built as per pradhikaran rules now they have put a request in the court for transfer of the property onto their name so what can I do