Art. 59 BV; Art. 46 Abs. 1 BV; direct constitutional complaint for alleged forum violation in guardianship matters; the exhaustion of cantonal remedies is not a prerequisite where the complaint asserts lack of domicile jurisdiction. The federal rules on the civil status of residents and sojourners, enacted in execution of Art. 46 Abs. 1 BV, determine for interstate guardianship the law and forum of the ward's domicile and confer an individual right to be heard by the competent authority. Like Art. 59 BV for personal actions, they delimit competence and oblige the authority to examine its jurisdiction ex officio. Alleged breaches may therefore be invoked directly before the Federal Court at any procedural stage (consid. 1).