question: Which child of M1 was M2 's Mexican editor
query: SELECT DISTINCT ?x0 WHERE {
  ?x0 ns:film.editor.film M2 .
  ?x0 ns:people.person.nationality ns:m.0b90_r .
  ?x0 ns:people.person.parents|ns:fictional_universe.fictional_character.parents|ns:organization.organization.parent/ns:organization.organization_relationship.parent M1
  }