CHICAGO – The original “The Stepfather” is such a product of its era that I have to admit that I went into the remake wondering what on Earth they could do to bring such an ’80s story into the ’00s. The answer turns out to be shockingly little. “The Stepfather” isn’t that bad. In fact, it’s better executed than I expected. It’s just a shadow of the original in that it never justifies its existence.