My uncle sold our joint family land in Chennai without my consent?

I'm from Chennai and recently found out my uncle sold our joint family property without informing me, one of the legal heirs. He claims he needed the money urgently, but I wasn't consulted at all. This land has been in our family for decades and holds sentimental value. What steps can I take to challenge this sale and protect my share in the property? I'm feeling blindsided and need urgent legal advice on how to proceed.