Historical clue formulations

• Typical holiday visitors — 2024-05-22
• Relatives by marriage — 2014-09-22
• They're often acquired at a wedding — 2011-06-12
• Some holiday visitors — 2009-04-05
• Strained relations? — 2007-07-23
• Marriage byproduct — 2003-01-16
• Strained relations? — 1999-10-13