1) you dont need your brother NOC for sale of your portion
2) if house has been partitioned by metes and bounds you are absolute owner of your portion .
3) you can give inspection to the purchasers partition deed or deed of settlement that has been made between you and your brother .
4) if your brother creates roadblocks in sale move court and obtain injunction against your brother restraining your brother from creating obstacles in sale of your portion of the house