Historical clue formulations

• Actors Alan and Robert — 2014-09-23
• Acting family — 2014-02-16
• Show-biz father and son — 2011-07-31
• Actors Robert and Alan — 2005-06-14
• Hollywood family — 2003-08-17
• Acting family — 2003-06-06
• Father-and-son actors — 2003-03-30
• Actors Robert and Alan — 2001-04-16
• Filmdom's Robert and Alan — 1998-03-01