How will grandfather's property be divided amongst sons and grandsons

I’m from Hoshiarpur (Punjab) & I live in a joint family.My Father has 1 elder brother & 2 sisters.My Uncle have 2 sons one of 37 years & other of 26 years.We are jewellers by occupation & we own 2 shops.My grandfather started this business.My grandfather left us in 1982.On one shop my father sits & on other shop my uncle.The elder son of my uncle sits with my father from last 17 years.The second son sits on both the shops on alternate days from last 4 years.I’m 18 years old & have started taking interest in business from last 7-8 days. Nowadays we have disputes among our family members & both the families want to separate from each other.When we sat for the distribution of all the assets,stock,properties etc. numerous disputes took place.My father told to divide everything in equal ratio between their brother but the both sons of my uncle said that they also want some percentage of the assets.So what should we do now?