From Special:PermanentLink/6558646#great-great-great-grandfather at WT:RFD:
The following information has failed Wiktionary's deletion process.
It should not be re-entered without careful consideration.
Past the traditional boundary between relatives and ancestors. --Connel MacKenzie 23:26, 5 June 2007 (UTC)
See also the discussion at Talk:great-great-great-grandmother, concluding that forms such as this should redirect to the iteration with one "great", with a usage note explaining that this can be extended ad infinitum. Cheers! bd2412 T 13:36, 14 January 2014 (UTC)