question: Was M2 's cinematographer and editor a British child of M1
query: SELECT count(*) WHERE {
  ?x0 ns:film.cinematographer.film M2 .
  ?x0 ns:film.editor.film M2 .
  ?x0 ns:people.person.nationality ns:m.07ssc .
  ?x0 ns:people.person.parents|ns:fictional_universe.fictional_character.parents|ns:organization.organization.parent/ns:organization.organization_relationship.parent M1
  }