What film director whose sibling produced M4 did M1 , M2 , and M3 employ
SELECT DISTINCT ?x0 WHERE {
?x0 a ns:film.director .
?x0 ns:people.person.employment_history/ns:business.employment_tenure.company M1 .
?x0 ns:people.person.employment_history/ns:business.employment_tenure.company M2 .
?x0 ns:people.person.employment_history/ns:business.employment_tenure.company M3 .
?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.producer.film|ns:film.production_company.films M4 .
FILTER ( ?x0 != ?x1 )
}