Questione giuridica chiave
Whether the child's appeal in federal court was admissible despite not having participated below.
Decisione estratta
The child lacked standing because he had not participated in the cantonal proceedings and no excusable reason for non-participation was shown.
Motivazione estratta
Party participation below is required under Art. 89(1)(a) BGG; the parents could have sought the child's participation earlier but did not.