In this scenario, the co-owner in possession (Khana Kasht) cannot sell the entire property or their whole share in a specific Khasra without the consent of the other co-owners. As per Indian law, a co-owner cannot unilaterally sell or transfer their share in a joint property without the consent of all co-owners. However, the co-owner in possession can sell their share in the property, but only to the extent of their ownership share. They cannot sell the entire property or any portion beyond their ownership share. To sell their share, the co-owner in possession should: 1. Obtain the consent of the other co-owners. 2. Determine the extent of their ownership share in the specific Khasra. 3. Ensure the sale deed clearly mentions the extent of the share being sold. 4. Register the sale with the relevant authorities. It is crucial to consult with a lawyer specializing in property law to ensure the sale is conducted legally and transparently. The lawyer can help: 1. Draft a sale agreement that accurately reflects the co-owner's share. 2. Ensure compliance with relevant laws and regulations. 3. Facilitate the registration process. Please note that specific laws and regulations may vary depending on the jurisdiction and location.