No.
The declaration of heirs does not, in and of itself, confer the status of heir.
It merely establishes the identity of the persons entitled to inherit, as well as their right to inherit in accordance with the will or the law.
Each heir retains their right of election, that is, the right to accept or renounce the estate within the time limits provided for by the Civil Code of Québec.
The status of heir arises from the acceptance of the estate, subject to the applicable provisions of the Civil Code of Québec.