The property belonged to your father
Your father had absolute rights in the property hence he was at liberty to dispose the property in the manner he decided
The sale consideration shall belong to your father alone and it is he who shall decide to dispose the sale consideration amount to anyone including settlement of any loans or debts outstanding against his name
Even if your father had transferred the entire sale consideration amount including any other amount from his savings to your younger brother alone, it is his decision, which cannot be disputed not his authority can be questioned by anyone.
You are his another child, there is no doubt about it,m, but this will not confer any right on you to claim any share out of his immovable or movable property which was disposed by him during his lifetime as per his own desire, will and wish.
Thus any step that may be taken by you in this regard as proposed by you shall not be legally maintainable, moreover you do not have the details that if this was fraudulently transferred to your brother's account, hence any step taken by you in this regard may even backfire
If you are still not convinced, you may consult a local lawyer in person and have a second opinion on this and then decide next course of legal action.