question: What costume designer was a British person whose parent married M3 and M4
query: SELECT DISTINCT ?x0 WHERE {
  ?x0 a ns:film.film_costumer_designer .
  ?x0 a ns:people.person .
  ?x0 ns:people.person.nationality ns:m.07ssc .
  ?x0 ns:people.person.parents|ns:fictional_universe.fictional_character.parents|ns:organization.organization.parent/ns:organization.organization_relationship.parent ?x1 .
  ?x1 ns:people.person.spouse_s/ns:people.marriage.spouse|ns:fictional_universe.fictional_character.married_to/ns:fictional_universe.marriage_of_fictional_characters.spouses M3 .
  ?x1 ns:people.person.spouse_s/ns:people.marriage.spouse|ns:fictional_universe.fictional_character.married_to/ns:fictional_universe.marriage_of_fictional_characters.spouses M4 .
  FILTER ( ?x1 != M3 ) .
  FILTER ( ?x1 != M4 )
  }