My father’s brother took advantage of him when he was drunk and tricked him into signing over our ancestral property. Is there any way to reclaim what rightfully belongs to our family?

Yes, you can potentially reclaim the property. Under Indian law, a contract signed under duress or undue influence, like being intoxicated, can be deemed voidable. You’ll need to prove your father was intoxicated and unaware of the consequences of signing, and that your uncle took advantage of this situation. You should consult a lawyer to explore legal options and build a strong case.