I remember reading them back in the early 90s (Robin Hood: Prince of Thieves, Far and Away, Back to the Future). They don’t seem to be a thing anymore (or am I just not noticing them).
As an aside I remember liking them but I was a preteen at the time so maybe they were terrible and I just liked the movies.
One I definitely remember reading, but not start to finish, was Ferris Bueller’s Day Off, in which Ferris and Jeanie do indeed have two younger siblings. The only other difference that I remember, as much as read, was that Sloane gave her thoughts on the place that human beings have in the universe. Or something like that.