question: Were M2 and M4 produced by a actor 's employer , directed by M1 's sibling , and directed by M3
query: SELECT count(*) WHERE {
  ?x0 ns:business.employer.employees/ns:business.employment_tenure.person ?x1 .
  ?x1 a ns:film.actor .
  ?x2 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 .
  FILTER ( ?x2 != M1 ) .
  M2 ns:film.film.directed_by ?x2 .
  M2 ns:film.film.directed_by M3 .
  M2 ns:film.film.produced_by|ns:film.film.production_companies ?x0 .
  M4 ns:film.film.directed_by ?x2 .
  M4 ns:film.film.directed_by M3 .
  M4 ns:film.film.produced_by|ns:film.film.production_companies ?x0
  }