Article 841-1 of the French Civil Code
If the notary appointed to draw up the liquidation statement comes up against the inertia of an undivided co-owner, he may give him formal notice, by extrajudicial act, to be represented. If the undivided co-owner fails to appoint a proxy within three months of the formal notice, the notary may ask the judge to appoint any qualified person to represent the defaulter until the operations have been completed.