No — and this is one of the clearest principles in Indian property law: a co-owner can sell only their own undivided share in the jointly owned property, not the whole property. Any attempt by one co-owner to sell the entire co-owned property without the consent of the other co-owners is legally invalid to the extent it purports to convey rights that the seller does not have.

The legal position is this: in co-owned immovable property — whether it is joint family property, property inherited by siblings together, or property purchased jointly — each co-owner holds an undivided share. A co-owner can alienate their own share without the consent of the other co-owners (unless there is a specific agreement restricting this), but they cannot sell the shares of the other co-owners or the whole property. If a co-owner enters into a sale agreement or executes a sale deed purporting to convey the entire property, that transaction is valid only to the extent of that co-owner's own share and is voidable — challengeable by the other co-owners — to the extent it encroaches on their shares. A buyer who purchases such a property without verifying the title properly takes on significant legal risk.

For a co-owner who wishes to sell but cannot get the other co-owners to agree — either to sell together or to allow buyout — the remedy is a partition suit before the civil court in Kanpur, seeking either a physical division of the property (division by metes and bounds) or, where physical division is impractical such as a flat or a small plot, an order for sale with division of proceeds. Once partition is decreed and the specific share is demarcated, each co-owner becomes the exclusive owner of their portion and can sell without anyone else's consent. The property lawyers and retired judges at the Kanpur panel of Aapka Legal Advice can advise on whether a consensual arrangement or a partition suit is the right path for your specific co-ownership situation and the nature of the property involved.