Unable to sell a property which has 8 members shares involved.

Hello all.. need an advice /idea. My late grandfather has a house in central area which is worth 2 cr now. Only his 4 sons are living in that house with their family.. it is a very old house n has problems like drainage, voltage no proper ventilation. My father has come out n and let his share for rental however the other brothers are staying in it and not showing interest to sell the house inspite of asking them several times. There are also 4 sisters Who may even come for share at the time of selling the property. They are saying to sell off only our share which will be 150sq ft. Nobody will buy like that. If someone buys the whole area then after can share the money . If we wanted to send notice against them then the aadhar of all 8 members is required which nobody will give. So share your thoughts on how to claim the property. Thanks in advance.