If your brother in law is reported to have died intestate then:
1. The property lying on his name shall devolve among his daughter, his second wife and his adopted child.
2. Insofar as the joint property in the name of him and his wife shall :
He and his daughter of first wife shall share fifty percent i.e., his wife share in the property;
As far his share in the property, it will be shared by his second wife, his daughter of first wife and his adopted child.
3. In respect of the joint property in the name of his wife and him, insofar as his share in the property, it will be shared by his second wife, his daughter of first wife and his adopted child.
4. The property lying on his second wife's name is her own and absolute proeprty, hence nobody can claim any rights in it at least not during her lifetime, after her death, her adopted child has full rights in it.
5. As far as his ancestral property is concerned, it will be shared by his second wife, his daughter of first wife and his adopted child.
6. The ancestral property of his first wife becomes her own property, hence after dividing it into two shares, one equal share will be allotted to her own daughter and insofar as his share in the property, it will be shared by his second wife, his daughter of first wife and his adopted child.