Is will valid if the mentioned person dies without getting probate?

Hello,nMy dad passed away a while back. My grandfather passed away last year and passed everything to my grand mother. But my uncles did not gave me will or got probate and got all the money in my grandmother account by nomination. Now my grand mother has passed away. Again, the will of my grand mother is not shared. Both my grand parents stayed with my uncle.As per Hindu law,n1) Is my grandfather will still active? I am told that it said after his death all his assets are for her wife. If he dies after my grandmother then hehad made various provisions - I don't know about them!n2) Can my grandmother will stand where all money from grandfather is claimed as nomination but no probate is taken?n3) whom to send notice?nnAppreciate your help,nThank you