question: Was a female sibling of a German film producer M2
query: SELECT count(*) WHERE {
  ?x0 a ns:film.producer .
  ?x0 ns:people.person.nationality ns:m.0345h .
  FILTER ( M2 != ?x0 ) .
  M2 ns:people.person.gender ns:m.02zsn .
  M2 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 ?x0
  }