Questione giuridica chiave
Whether the appeal was admissible and the late supplemental filing could be considered
Decisione estratta
The civil appeal was admissible; the supplemental letter filed out of time was inadmissible.
Motivazione estratta
The judgment was final, from the last cantonal instance, in a pecuniary family matter above the value threshold, and the appeal was filed in time. New submissions after the deadline cannot be considered.