Option to go against will

Hi... My father passed away in 2003 and me, sister and mom are staying with my Grandfather ( father's dad ).... We weren't given any of my Dad's money or workplace .... The workplace is in grandfather's name ... :(.... Recently I got a chance to read the draft copy of my Grandpa's will and found that we are completely duped... Grandfather has given property worth 18 crores to my uncle and another uncle's son...and giving me a property worth 90lakhs only(that too I've to pay first 2 years rent to my uncle )...What can I do to claim my right ? This is pure injustice....:( If this will comes to force, all our lives will get shattered...someone please help...👛🙏