My grandmother died on september 2004. By july 2004 itself she has made a will to grant my father the legal rights to the house that we are living in. My grandfather and my grandmother's close friend signed on the witness tab. My grandmother has eight children. Only my father took care of her in her old age(Thats the reason she made the will). The will is not yet executed and the property has not been transferred to my father's name(still in my deceased grandmother's name) because no one has made any claim(yet). My question is:
1. What is the procedure to transfer the property to my father's name?
2. What do to if my father's siblings made a claim to the house. They are not aware of the existence of such will?
3. Shall I built a separate portion on the terrace for myself by investing my own money. If the other heirs claim is legal will I be at loss or shall I continue using the portion since I also legally have rights on the property?
Please clear my doubts. Thanks in advance.