Hi Rajendra,
You can file for an injunction to prevent your father's brother from cultivating the agricultural land. However, to ensure proper legal action, you may need to prove your right over the property and establish grounds for stopping the cultivation. An injunction order can be sought from the court, but the process requires proper documentation and legal procedures to be followed.
Since property disputes can be complex, especially when dealing with long-term caretakers, it would be best to consult with a lawyer who can guide you through the process and ensure your interests are protected.
Feel free to reach out to me at anshu@lawfinitysolutions.com for further assistance.