Historical clue formulations

• Brood — 2023-09-17
• "Nothing in life is fun for the whole ___": Jerry Seinfeld — 2020-01-21
• Zoological classification — 2003-12-08
• G-rated — 2003-10-01
• Kind of tree — 1999-08-01
• Zoological classification — 1999-01-19
• The Three Bears, e.g. — 1998-08-30