question: Did a British film director whose sibling directed M4 , M5 , and M6 write M1 and M2
query: SELECT count(*) WHERE {
  ?x0 a ns:film.director .
  ?x0 ns:film.writer.film M1 .
  ?x0 ns:film.writer.film M2 .
  ?x0 ns:people.person.nationality ns:m.07ssc .
  ?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.director.film M5 .
  ?x1 ns:film.director.film M6 .
  FILTER ( ?x0 != ?x1 )
  }