Welcome. This is the discussion space attached to the Language Atlas, built around the language families that hold the many languages of the world together, and honest about how contested that classification genuinely is almost everywhere. A few house rules: keep a disagreement about evidence rather than about people, and cite what you can.
The atlas itself is still being built. Every room below carries an opening note from the curator to start it off, and you are welcome to open your own thread on anything those rooms cover, or to use this room for whatever does not fit a narrower one.