What character that a film was executive produced by and M2 was written by was M0 's sibling
SELECT DISTINCT ?x0 WHERE {
?x0 a ns:fictional_universe.fictional_character .
?x0 ns:film.producer.films_executive_produced ?x1 .
?x0 ns:film.writer.film M2 .
?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 M0 .
?x1 a ns:film.film .
FILTER ( ?x0 != M0 )
}