Land Inheritance

Hi, Uttaranchal My father died in May 2005, My mother and I are in a process to get the land transferred to my Mom's name. We are 3 siblings. (Me and 2 sisters) We siblings do not have any disputes amongst ourselves. Scenario 1 My father had 2 brothers, 1 brother got sepearted and is now out of the picture. Since we as a family were residing in Mumbai the other brother got the remaining property under his name. Post my father's death he did agree for partition and give our share of land. However this has been going on only on verbal basis. Can you let me know how I can get foolproof my claim and get the property registered under my Mom's name or the best thing to get our share transferred equally between my Mom, me and my 2 sisters. Both my sister's are married (year 2004 & 2005) Since the property is under my father's brother's name till now do I have to be at their mercy or can openly challenge for a speedy process. Are there any exceptions or conditions through which my cousin's can deprive me of my right?