As for the Carpenters, there was this sort of rumor-like vibe that they were siblings with a disability, or rather, that the brother and sister loved each other and held a wedding in Morocco where consanguineous marriage is permitted, that kind of rumor-ish wind...
There are not a few people who believe rumors like that the Carpenters were “kyodai-ji” (siblings with disabilities) or that the brother and sister loved each other and held a wedding in Morocco where consanguineous marriage is permitted, and so on. Moreover, it’s not like they read gossip or speculative articles in weekly magazines; a common pattern is that they read it in something like the liner notes (booklet) attached to a CD, or they heard it from a knowledgeable person, that sort of channel by which they saw or heard the story. In a similar vein, there are also many people who believe that Freddie Mercury of Queen had sex reassignment.
This case is part of the Mandela Effect case database based on "The Window of Opportunity: A Guidepost to the Mandela Effect — The Ultra-Secret X-Files" by Aoyama Takuto.