What will happen with Wife's property after her death.

Sir, I am 56 years old and just 1 month before my wife died due to heart attack. I bought the plot on my wife's name and built the house. I have 3 kids 2 sons and 1 daughter and all are married. Just after couple of week passing my wife there is dispute arrise between my both sons and claiming the property and forcefully aquired 4 rooms by them 2 room by each. During my wife tretment my daughter and my younger son helped a lot but my elder son did not helped a bit. He became Joru Ka Gulam and trying to acquire full property by hook or by crook. My elder son and his wife also told me he would not going to entertain me at any cost. I am helpless, please suggest me 1. How do I claim property which remain with me till my death and after death it will go to whomever I want. 2. How to remove my elder son from that property 3. If partition take place how many partition will be done ( as per my knowledge it will go in 4 part :- Me, both son and Daughter) and whom to given choice to decide which roome will be given to whom. Please guide me SIR....