question: Did M3 star M4 and M5 , star a art director 's American sibling , and star a screenwriter
query: SELECT count(*) WHERE {
  ?x0 a ns:film.writer .
  ?x1 ns:people.person.nationality ns:m.09c7w0 .
  ?x1 ns:people.person.sibling_s/ns:people.sibling_relationship.sibling|ns:fictional_universe.fictional_character.siblings/ns:fictional_universe.sibling_relationship_of_fictional_characters.siblings ?x2 .
  ?x2 a ns:film.film_art_director .
  FILTER ( ?x1 != ?x2 ) .
  M3 ns:film.film.starring/ns:film.performance.actor ?x0 .
  M3 ns:film.film.starring/ns:film.performance.actor ?x1 .
  M3 ns:film.film.starring/ns:film.performance.actor M4 .
  M3 ns:film.film.starring/ns:film.performance.actor M5
  }