question: Were M2 , M5 , and M6 executive produced by a screenwriter whose sibling played M1 and produced by M3 and M4
query: SELECT count(*) WHERE {
  ?x0 a ns:film.writer .
  ?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.actor.film/ns:film.performance.character M1 .
  FILTER ( ?x0 != ?x1 ) .
  M2 ns:film.film.executive_produced_by ?x0 .
  M2 ns:film.film.produced_by|ns:film.film.production_companies M3 .
  M2 ns:film.film.produced_by|ns:film.film.production_companies M4 .
  M5 ns:film.film.executive_produced_by ?x0 .
  M5 ns:film.film.produced_by|ns:film.film.production_companies M3 .
  M5 ns:film.film.produced_by|ns:film.film.production_companies M4 .
  M6 ns:film.film.executive_produced_by ?x0 .
  M6 ns:film.film.produced_by|ns:film.film.production_companies M3 .
  M6 ns:film.film.produced_by|ns:film.film.production_companies M4
  }