According to some sources, a minor but pivotal character in Elfen Lied (both manga and anime) is the older sister of a main character, a fact not revealed in the series itself, but on the 'Official Website' after it was done. My problem arises in that, when checking net sources to verify this as best I could, I found that each and every site that listed this possible fact had the exact same sentence to describe it--verbatim, with not a variation to be found anywhere it was cited. Also odd, the term 'official website' is not as helpful as it would seem. About four sites minimum match up with that description, one from the mangaka, one from the publisher of the manga, one from the anime producer, and one more that is apparently down for the count; all are/were in Japanese.
As a result, I am more doubtful of this alleged fact that I might normally be. I don't think anything as silly as a conspiracy, but more like someone who thought this was true posted it as a verified fact, and this fact got copied & pasted ad infinitum without being checked. So, in your view, and I appreciate any input at all, am I right based on these factors to have serious doubts about this?
BTW, I have noted this on the wiki in an appropriate article, but wanted to see if the premise of my having doubts was sound in anyone's view.