Was M3 produced by a film producer 's sibling and written by a star of M0 and M1
SELECT count(*) WHERE {
?x0 ns:film.actor.film/ns:film.performance.film M0 .
?x0 ns:film.actor.film/ns:film.performance.film M1 .
?x1 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 .
?x2 a ns:film.producer .
FILTER ( ?x1 != ?x2 ) .
M3 ns:film.film.produced_by|ns:film.film.production_companies ?x1 .
M3 ns:film.film.written_by ?x0
}