Who was a Mexican film producer whose child produced M3 and M4
SELECT DISTINCT ?x0 WHERE {
?x0 a ns:film.producer .
?x0 a ns:people.person .
?x0 ns:people.person.children|ns:fictional_universe.fictional_character.children|ns:organization.organization.child/ns:organization.organization_relationship.child ?x1 .
?x0 ns:people.person.nationality ns:m.0b90_r .
?x1 ns:film.producer.film|ns:film.production_company.films M3 .
?x1 ns:film.producer.film|ns:film.production_company.films M4
}