Looking through support requests, it appears that there is work on upgrading to D6. For some reason, the Upgrade Status module (http://drupal.org/project/upgrade_status) indicates no current D6 upgrade work.

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Aren Cambre’s picture

Aren Cambre CreditAttribution: Aren Cambre commented
Status: Active » Closed (won't fix)

This appears abandoned: #219387: Is Node Family abandoned?