Dispute by children on a sold property

Sir, A person named X has divided all his properties (all purchased by him) between him and his two sons (he has only two sons) through a Partition Deed which is registered. The second son (seller) has two minor daughters and I have purchased a land from him. He has land at different locations and all received through the above partition. Whether the minor girls have right in the property as all the properties are divided by X himself and yet he is alive? If the minor girls have a right the seller also has a right over 1/3rd of the total property given to him and this land sold to me comes around 1/3rd of the total area. So is the sale correct, as no other land is sold by him? Or he has only 1/3rd right in every individual land, so the minor girls can also claim rights in this piece of land. Further, in the sale deed the seller has signed for himself and as a guardian for his 2 minor daughters. I have divided the sale amount into three equal halves, paid his share by cash and made two Fixed Deposits in the names of minor children separately and gave the certificates also to him. The FD amount and certificate details are also mentioned in the sale deed. This is registered in Tamil Nadu. Now whether the minor daughters can challenge in the court and get back my property.