The Cable Guy is a 1996 American comedy film directed by Ben Stiller, starring Jim Carrey and Matthew Broderick. It was released in the United States on June 14, 1996. The film co-stars Leslie Mann, Jack Black, George Segal, Diane Baker, Eric Roberts, Owen Wilson, Janeane Garofalo, David Cross, Andy Dick, Amy Stiller, and Bob Odenkirk.
The director's relative appeared in the film, The Cable Guy.  
Ben Stiller and Amy Stiller share the same last name and are in fact, brother and sister.  Therefore this statement is definitely correct.  However, the system may not have understood the relationship between the two last names i.e. that two people with the same last name are often related to each other.  