question: Were M2 and M4 edited by M0 's actor , written by M3 , and edited by M1 's sibling
query: SELECT count(*) WHERE {
  ?x0 ns:film.actor.film/ns:film.performance.character M0 .
  ?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 M1 .
  FILTER ( ?x1 != M1 ) .
  M2 ns:film.film.edited_by ?x0 .
  M2 ns:film.film.edited_by ?x1 .
  M2 ns:film.film.written_by M3 .
  M4 ns:film.film.edited_by ?x0 .
  M4 ns:film.film.edited_by ?x1 .
  M4 ns:film.film.written_by M3
  }