My mother in law is co-owner i.e. 50% owner of a property co-owned by my husband. She doesnt want to stay with us anymore and wants us to pay Rs. 10 lacs to her by Aug 2016 or earlier (whenever we arrange 10 lacs) and till then we have to pay her Rs. 4000 maintenance on the 10th of every month. Once we pay her Rs. 10 lacs, she says she will remove her name from the property completely. She is in MP and we are in Mumbai. We are giving her 6 post dated cheques of Rs. 4000 for her assurance. How to prepare legal papers for this? Do we have to notarize?