Nomination problem

In family there are 4 brother and.Father and mother expired long time back ( note ) one brother expired he was bachelor and given all his wealth to one of his brother son through nomination in banks and other financial institution ( in this case we have discussed the matter with different lawyer all of them are saying nominee is only care taker not the owner. As they are saying all the amount should be distributed among them 3. brother as they are legalhires the deceased was having faith on the nephew to whom he has nominated now the deceased brother are saying that they will get the amount through court and again they are saying the same that they are legalhires the amount has been realesed by the nominee plz help as in this case 1) The deceased is bachelor. 2) Father and Mother expired. 3) Their is no legal bill. 4) nomination given to nephew. 5) 3.brothers are saying they are legal hires and they are saying to get the amount back through court as they are not having good relationships with deceased the deceased nominated his nephew. So plz tell is there is any law by Court that the amount released by the nominee will be given back to legalhires or nominee has the right to retain it Thanks plz help in this matter