Brother sold our joint family property without informing me in Pune, is this legal?

I just found out that my brother sold our joint family property in Pune without my consent. I was in Mumbai and had no idea about this sale. This property was passed down from our parents, and I am one of the legal heirs. I feel betrayed and confused about my rights. Can he do this? What steps should I take immediately to address this situation? I am worried about the legal implications and how I can possibly get my share.