1. Indo-European
   1. Italic
      1. Romance
         1. Italo-Western
            1. Western
            2. Gallo-Iberian
            3. Ibero-Romance
            4. West Iberian
            5. Castillian
            6. Portugues-Galician
            7. Galican
            8. East Iberian
            9. Catalan
            10. Valencian
2. Proto-Caucus
   1. Caucasian
      1. Proto-Basque
         1. Basque