Historical clue formulations

• Parent in a blended family — 2023-09-26
• Relative by marriage — 2021-12-31
• Edward Murdstone, to David Copperfield — 2013-12-20
• Pop from a different line — 2012-01-07
• New old man? — 2008-12-06
• Mike Brady of "The Brady Bunch," e.g. — 2007-07-28
• Member of a blended family — 2005-10-09
• Acquired family member — 2005-09-06
• Blended family member — 2001-08-07