Was a sibling of a art director of M0 M1
SELECT count(*) WHERE {
?x0 ns:film.film_art_director.films_art_directed M0 .
FILTER ( M1 != ?x0 ) .
M1 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 ?x0
}