My grandfather acquired our family home a long time ago. He had eight children from two wives. The property is now registered in my father and uncle’s names. If we decide to sell the house, could any of my father’s siblings file a legal challenge against the sale?

Yes, your father’s siblings could potentially file a legal challenge. Under Indian law, all legal heirs have a right to the ancestral property, even if it’s not registered in their names. They could argue that the transfer to your father and uncle wasn’t fair or that their rights were not considered.