statutorily all his brothers and sisters are his successors and also the heirs of brothers or sisters who are no more are also entitled for share in the property. The property should be equally divided amongst the all brothrs and sisters first and thereafter from their each individual share further should be divided amogst the heirs of deceased brothers and sisters. If land cannot be partitioned, it should be disposed off and consideration received can be divided.
As a lawyer I would first advise you to approach appropriate court for probate and appoint an executor to do all these. Consult lawyer and file an application in court with signature-applicant of all the successors i.e. brothers and sisters and also include the heirs of deceased brothers and sisters.