The property in the name of first wife shall devolve on her own legal heirs and the children of second wife shall not be entitled to any share or rights in that property.
The second wife has no right to to not to allow the daughter of first wife to acquire her deceased mother's property who died intestate.
The daughter of first wife can file a suit for ejecting her step mother and possession of the properties left behind by her deceased mother and also on behalf of her sister or jointly.
Consult a local lawyer and proceed as per further advise by the lawyer.