Since the property is purchased by 1st wife after her demise the property would devolve to her legal heirs husband children and to her mother if alive.husband can transfer only his share in the same only to second wife.second wife can't sell entire house to you. You told her son consented is it in a stamp paper. If in a stamp paper it is valid. Did both the son gave consent. But he must sign in the deed too. You will have to give her daughter a share.second wife can enjoy only 1/4of the share in her name as her husband has 1/4share if he transferred whole to her that transaction is invalid. Issue a legal notice for cheating and for illegal transaction and then file a case for getting back the amount with damages.or you settle the same amicable by giving her share amount if you need the house.file a criminal case for cheating and illegal transaction too