What sibling of a film director wrote , executive produced , and directed M1 's prequel
SELECT DISTINCT ?x0 WHERE {
?x0 ns:film.director.film ?x1 .
?x0 ns:film.producer.films_executive_produced ?x1 .
?x0 ns:film.writer.film ?x1 .
?x0 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 ?x2 .
?x1 ns:film.film.sequel M1 .
?x2 a ns:film.director .
FILTER ( ?x0 != ?x2 )
}