irfan 16 July 2023
T. Kalaiselvan, Advocate (Advocate) 17 July 2023
If your sibling is threatening to sell the jointly owned property, then you can file a suit for partition with an application seeking injunction to restrain him from alienating or encumberig the property in any manner till the disposal of the suit for partition.
Dr. J C Vashista (Advocate ) 17 July 2023
Seek permanent injunction against your sibling through a local prudent lawyer.