regarding the availability of legal actions against money fraud !!!!!!

my grandfather was a lawyer and he passed away a year ago and two years back a person(friend of my uncle) took 14 lakhs from him. Now after my grandfathers passing when my father asked my uncle about the status of that money he said i dont know and grandfathers bank records doesn't show any money either nor my grandfathers junior or his munshi know about the money, we first contacted them(uncle ,junior,munshi) because they were the only ones closest to my grandfather, then we went to see that person(borrower and uncles friend) ,he said i had returned the money to my grandfather but he has no proof and when we asked when you returned the money is any one else was present there(3rd person) he said 'No' and again when we asked uncle about the money, this time he said money was returned by him, exact same thing his friend said. so i want to know if i we can take any legal action against them ????