Questione giuridica chiave
Whether the complaint could be entertained on behalf of the heirs other than P. X.
Decisione estratta
No. The other heirs had waived continuation of the cantonal appeal, which implied withdrawal of authority to pursue the federal proceeding; no new authority was shown.
Motivazione estratta
Their declaration accepting the first-instance judgment and renouncing continuation amounted to revocation of the power of attorney for further litigation. Only P. X.'s mandate covered the federal complaint.