my father sailed our property to a person for building apartment with agreement of giving half amount in case and other half in the form of 5 falts. when he started constructing since we are in need of money, my father gave one more flat to him for very less amount. now for another 4 flats, he is not ready to give only, he is saying what ever floor he give that only we have to take. he is asking to take in 4th floor, we are asking in 2nd floor. and also he is saying we only as to give registration fees. and one more thing is my father expired 6 months back. please advise and help.