1. You have not rceived any notice in connection with he application of probate of your father's will,
2. Legally you can claim that you are not yet aware of the said will,
3. File a partition suit immediately claiming share of your father's property,
4. Your brother will certainly submit before the Court that the said property has been willed by your father for which he has already got the grant of probate,
5. Demand and Collect all the documents including the process note in connection with the said grant of probate,
6. File an application challenging the grant of probate without serving notice on you properly.