Partition of Joint Property

Dear Sir, I have heard about your reputation in handling the case very efficiently. Hence, I approach you with a problem and request guidance to move further in the matter. I am 50% owner of an apartment in Bhowanipore, Kolkata 700020 with my late brother who has died without leaving a written Will about 7 years back. His wife also died about 4 years back without leaving a written Will and is survived by two sons. One son is married but he has no children. He lives in Middle East country. Address NOT KNOWN. Another son is single and a US citizen. Address NOT KNOWN. PROBLEM: My late brother’s children are not cooperative in partition of the property. 1. In this situation how can I claim my share of the property? 2. Is it possible to get an order from the competent court for partition of property? Since their addresses are not known, can we file a petition for the ex-party hearing after giving a public notice in newspaper per court direction? 3. How long would it take to resolve it?