What child of M0 executive produced M1 's prequel
SELECT DISTINCT ?x0 WHERE {
?x0 ns:film.producer.films_executive_produced ?x1 .
?x0 ns:people.person.parents|ns:fictional_universe.fictional_character.parents|ns:organization.organization.parent/ns:organization.organization_relationship.parent M0 .
?x1 ns:film.film.sequel M1
}