My father has registered his entire property, inherited from my grandfather, in my sister’s name. Is this legally valid? I believe I have rights to this property as my grandfather’s grandson. My sister is planning to sell the land without my knowledge. How can I stop this and what legal steps should I take?

Yes, your father could legally register the property in your sister’s name, but you may have a claim to it as your grandfather’s heir. You can file a partition suit in court to claim your share of the property. You should consult a lawyer immediately to understand your legal rights and options to prevent the sale.