Is step mother a class 1 or class 2 legal heir interest of hindu succession act

One of the property is a gift deed from our step mother to my deceased brother. (Which she did by taking money, but on paper it's a gift deed). The chief officer has now giving an acknowledgement to my brothers wife and son saying that according to Hindu succession act mother (including step mother) is a class 1 legal heir....how to proceed after getting an injunction order for this and claiming my brothers son to be the rightful legal heir along with his mother

Thank you for your opinions. We don't mind if the property given as gift deed is shared by the step mother, but the chief officer has clubbed other properties also of my deceased brother and given an equal share to my step mother. (Chief officer has been bribed) Can this be over turned easily in civil court?

Strange all 4 replies disappeared suddenly.  Contact a local advocate and ask him whether she is a Class 1 legal heir or as father's wife a Class ii legal heir. Who is the chief officer?  Where is the question of bribes?  How she can get a title through his remarks/opinion?

There is no will done by my brother, he would never give anything to his step mother even if he was alive, such was thier relationship. Since he has died intestate, can step mother be termed as equal to class 1 legal heir with son and wife? The chief officer has taken a legal opinion from a local lawyer and done this.