Who was a sibling of M1 's editor and executive producer
SELECT DISTINCT ?x0 WHERE {
?x0 a ns:people.person .
?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 ?x1 .
?x1 ns:film.editor.film M1 .
?x1 ns:film.producer.films_executive_produced M1 .
FILTER ( ?x0 != ?x1 )
}