question: Who was a screenwriter whose sibling directed M4 and edited M2 and M3
query: SELECT DISTINCT ?x0 WHERE {
  ?x0 a ns:film.writer .
  ?x0 a ns:people.person .
  ?x0 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 ?x1 .
  ?x1 ns:film.director.film M4 .
  ?x1 ns:film.editor.film M2 .
  ?x1 ns:film.editor.film M3 .
  FILTER ( ?x0 != ?x1 )
  }