No.
The declaration of heirs does not, itself, confer the status of heir on anyone.
It only establishes the identity of persons called to the succession as well as their right to inherit in accordance with will or the law.
Each heir retains their right of option, to accept or renounce the inheritance within the time limits provided by Civil Code of Quebec.
The status of heir results from the acceptance of the inheritance, subject the applicable provisions of the Civil Code of Quebec.