well done, but wasn't this a play once?

Rating: Null/10 (13 August 2001)

a well acted and directed film, very spooky. but the plot seemed familiar to me, and then i remembered that there was a play, originally titled "THE OTHERS", which was done on Broadway under the title "VOICES" with Julie Harris and Richard Kiley. VERY similar plot, with the exact same ending. Should the director/writer maybe have given some credit where credit was due? Or was this just coincidence.