question: Was M2 a art director whose sibling played M0 and played M1
query: SELECT count(*) WHERE {
  ?x0 ns:film.actor.film/ns:film.performance.character M0 .
  ?x0 ns:film.actor.film/ns:film.performance.character M1 .
  FILTER ( M2 != ?x0 ) .
  M2 a ns:film.film_art_director .
  M2 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 ?x0
  }