Historical clue formulations

• Family units — 2023-12-22
• The Hatfields and McCoys, e.g. — 2023-08-04
• Groups identified by tartans — 2020-11-17
• Tribes — 2018-11-16
• Groups of gamers — 2015-07-17
• Online gaming guilds — 2014-01-12
• Family groups — 2011-11-07
• Related groups — 2009-12-13
• Family groups — 2009-08-17
• Chieftains' groups — 2006-08-12
• Extended families — 2004-07-07
• Their names may start with "Mac" — 2003-03-21
• Sometimes warring groups — 2002-09-07
• Reunion groups — 1999-06-09
• Feud participants — 1999-04-03