question: Which screenwriter did a art director marry and M1 's sibling marry
query: SELECT DISTINCT ?x0 WHERE {
  ?x0 a ns:film.writer .
  ?x0 ns:people.person.spouse_s/ns:people.marriage.spouse|ns:fictional_universe.fictional_character.married_to/ns:fictional_universe.marriage_of_fictional_characters.spouses ?x1 .
  ?x0 ns:people.person.spouse_s/ns:people.marriage.spouse|ns:fictional_universe.fictional_character.married_to/ns:fictional_universe.marriage_of_fictional_characters.spouses ?x2 .
  ?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 .
  ?x2 a ns:film.film_art_director .
  FILTER ( ?x0 != ?x1 ) .
  FILTER ( ?x0 != ?x2 ) .
  FILTER ( ?x1 != M1 )
  }