You've purchased agricultural land previously owned by a Muslim man. While his second wife and son consented to the initial sale, his first wife and her children are now claiming rights, stating they did not consent. Muslim law does not recognise ancestral property in the same way as other personal laws, and typically, an individual can sell inherited property without the consent of all heirs. However, it's crucial to verify if any objections were raised during the initial sale and understand the specific legal standing of the first wife and her children in this situation.