question: Was M2 written by M3 , produced by a art director 's sibling , and written by a person
query: SELECT count(*) WHERE {
  ?x0 a ns:people.person .
  ?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 ) .
  M2 ns:film.film.produced_by|ns:film.film.production_companies ?x1 .
  M2 ns:film.film.written_by ?x0 .
  M2 ns:film.film.written_by M3
  }