question: Were M1 and M4 directed by a screenwriter 's sibling 's child and edited by M2 and M3
query: SELECT count(*) WHERE {
  ?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.sibling_s/ns:people.sibling_relationship.sibling|ns:fictional_universe.fictional_character.siblings/ns:fictional_universe.sibling_relationship_of_fictional_characters.siblings ?x2 .
  ?x2 a ns:film.writer .
  FILTER ( ?x1 != ?x2 ) .
  M1 ns:film.film.directed_by ?x0 .
  M1 ns:film.film.edited_by M2 .
  M1 ns:film.film.edited_by M3 .
  M4 ns:film.film.directed_by ?x0 .
  M4 ns:film.film.edited_by M2 .
  M4 ns:film.film.edited_by M3
  }