question: Did M2 star M1 's child and star M0 's editor
query: SELECT count(*) WHERE {
  ?x0 ns:film.editor.film M0 .
  ?x1 ns:people.person.parents|ns:fictional_universe.fictional_character.parents|ns:organization.organization.parent/ns:organization.organization_relationship.parent M1 .
  M2 ns:film.film.starring/ns:film.performance.actor ?x0 .
  M2 ns:film.film.starring/ns:film.performance.actor ?x1
  }