question: Did M2 star a Mexican person 's parent 's child and star 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.children|ns:fictional_universe.fictional_character.children|ns:organization.organization.child/ns:organization.organization_relationship.child ?x2 .
  ?x2 a ns:people.person .
  ?x2 ns:people.person.nationality ns:m.0b90_r .
  M2 ns:film.film.starring/ns:film.performance.actor ?x0 .
  M2 ns:film.film.starring/ns:film.performance.actor M3
  }