How are the Kartvelian languages related to the Caucasian language groups?

The Kartvelian languages, also known as South Caucasian or Iberian languages, constitute one of the three major families of Caucasian languages, alongside the Northwest Caucasian (Abkhazo-Adyghian) and Northeast Caucasian (Nakho-Dagestanian) groups.1

While these three families are grouped together geographically as indigenous to the Caucasus region, their genetic relationship remains a subject of linguistic debate. Current research indicates the following:1

• Separate Families: At the present stage of comparative linguistics, the North Caucasian and South Caucasian groups are viewed as distinct language families.1
• Uncertain Interrelationships: There is no conclusive evidence of a genetic link between the South Caucasian (Kartvelian) family and the North Caucasian groups, as researchers have not identified regular sound correspondences between them.1
• Typological Positioning: While the Northwest and Northeast Caucasian groups represent opposite structural types, the Kartvelian languages occupy an intermediary position from a typological perspective.1

The Kartvelian family itself consists of Georgian, Svan, Mingrelian, and Laz, all of which descend from a common Proto-Kartvelian ancestor.23