Legal heirs rights

This is a very typical case of legal heir of hindu family and their rights. Consider that there are 3 legal heirs (brothers) for a property, after expiry of the parents. Property is earned by parents and is not ancestral. And as usual off-course there is no deed by any of the parents. Is it possible to sell the parents property by any one heir, on the basis of nomination in co-operative society, without knowledge of the other two heirs ? If yes how can all the legal heirs protect their own share in their parents property ?