question: Was M2 executive produced by M3 , written by M4 , and written by a child of a Mexican sibling of M0
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.nationality ns:m.0b90_r .
  ?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 M0 .
  FILTER ( ?x1 != M0 ) .
  M2 ns:film.film.executive_produced_by M3 .
  M2 ns:film.film.written_by ?x0 .
  M2 ns:film.film.written_by M4
  }