Rights for property for second wife daughter

A married to B (first wife) who has 3 sons after that A married C (second wife) who has two daughters ( without divorcing B) , there was a house which was self acquired by A 's mother and a will was created stating after the death of her, her son A can have it utilised after the death A all the five children (three son of first wife and two daughters of second wife) can utilize the property, now before the death of A's mother the will has be changed to those three sons after removing the names A ( father and two daughters) and it was not informed untill the A's mother expired to A and his second wife's daughter. Now the three sons are asking to vacate that home where A and his second wife along with his daughters have lived for more than 27 years, is there a option to cancel the registration of the newly registered document or do the A or the two daughters have any rights on this property.