Which film producer whose sibling directed M3 , wrote M1 , and executive produced M2 did M4 's employer employ
SELECT DISTINCT ?x0 WHERE {
?x0 a ns:film.producer .
?x0 ns:people.person.employment_history/ns:business.employment_tenure.company ?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:business.employer.employees/ns:business.employment_tenure.person M4 .
?x2 ns:film.director.film M3 .
?x2 ns:film.producer.films_executive_produced M2 .
?x2 ns:film.writer.film M1 .
FILTER ( ?x0 != ?x2 )
}