Claim on Without Will Assets -- as per Hindu Family

Family Structure  >>>>  Dead  Elder Brother Mr. X >> Bachelor and No will to write of his Assets 

                                       Dead Younger Brother Mr. Y >>Married >>> Have a Son Mr. A

                                       Dead Younger Sister Mrs. Z >>> Married >>>> Have a SON Mr. B 

Important: Relation >> Between Mr. X and Mr. B is MAMAJI AND BHANJA 

Question :   Is  Mr. B ( Bhanja) Eligible to  Claim  on Assets of Mr. X ( Mamaji ) ???? 

Please reply ... thanks