How to sell property while judgment on appeal is pending

My cousin had a property (land with house) in his wife's name. The land was purchased from the proceeds of sale of his inherited property and the house was built using mutual earnings of cousin and his wife. After the decease of his wife, the ownership of property was in dispute in between cousin and his mother in law. Cousin's mother in law filed a case against cousin to get the ownership of the property. She won the judgement due to some reason. They were also able to forcefully capture the property using men-power. An appeal was submitted by cousin against the judgment of lower court and it's hearing is still pending. Cousin's mother in law passed away recently. Now it is heard that siblings of my cousin's wife have sold the property. Is it possible to sell a property (if it is, is it legal) while the judgment on appeal is still pending?