Weren't they all (or most of the band) in the same family though? That being said, I have to take much of that article with a grain of salt. It's not like they were hiding direct subliminal messages in their music, even if that article is trying to suggest otherwise.
The Sign was a great album, and I even liked much of The Bridge haha. Totallll guilty pleasure of mine in the 90s, but they will never be a R&R HOF nomination.