Hi
1. The tehasildar may hold the mutation as you have objected .
2. The Brother has sold the share which was not demarcated and assigned to him with a physical division.
3. The precious portion of the land which was sold without consent of other legal heirs affected the market value of the existing shares and it can cause financial loss.
3. the Portion sold was not demarcated and the right in the portion of property which he assumed is against the interest of the other brothers.
4. Brothers can file a civil suit for the cancellation of the sale deed and ask for a physical division into metes and bounds or go for a settlement for an equal division interns of value.
5. should seek a stay/ injunction on the transfer /mutation till the matter is decided