Query

Greetings to all Experts !!! My mother went to my real sister's house ( Located in City X) happily to meet grand children, and when she came back( to our city Y), she was a but silent and tensed.Then after a while she revealed that my sister and my brother-in-law forced her to make a WILL of our FLAT in their name but she somehow avoided them. After that my mother had received few calls also from my sister which further is adding to my mother's tensed behaviour. Today I got a call from my sister and she said - she would be coming next week to meet us just like that, that too Alone when she has two kids at home , one is 6 year old and another is 4 year old. It is well known to us , that my brother-in-law ( my sister's husband) is a very dishonest person and is basically a property dealer though he calls himself an architect. FLAT is duly registered in my mother's name after my father's death. When registry was done all legal heirs inlcuding my sister had signed in front of sub registrar and agreed to transfer full ownership to my mother, and hence REGISTRY was done. What all can I do here legally so that I can help my mother to get rid of the tension. How can I stop calls if they start flowing in incessantly ?