Will by my father all the properties and monies due to my brother

Dear Sir, I am Sunni Muslim writing from Chennai, Tamil Nadu. Seeking your kind advice on the below mentioned legal issue. Question 1 To my father we are 3 children, 1 elder Sister, 1 Son(me) and another son(my younger brother) the case is my father had around 5 properties and has written a will around 10 months back before his demise. As per the will the, my father has given all the properties in the name of my younger brother, except one property which is jointly registered in my name and my younger brothers name. And my younger brother feels that is justice done. Question 2 My father has got insured himself from LIC and other private insurer on his life. The money which has been received by in the form of Sum Assured after death claim of my father is also taken by younger brother. He has also received the monies arising out of Postal savings. And also my younger brother has taken the Pension of my father and is using for his personal use. Personally my younger brother is no way interested in sharing the said properties and monies. He is considering himself as a rightful owner and doesn't want to part with us Please advice me on to how go about this and also tell me whether If I fill for a partition suit on the properties and the monies recieved under the Muslim Sharia Law or Mohammedan Law what are my chances of getting the justice to me and my sister. Do Advice me on the issues, Advance Thanks for Your Speedy Respone ! ! !