Was a sibling of a art director of M2 and M3 influenced by M0 and M1
SELECT count(*) WHERE {
?x0 ns:influence.influence_node.influenced_by M0 .
?x0 ns:influence.influence_node.influenced_by M1 .
?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.film_art_director.films_art_directed M2 .
?x1 ns:film.film_art_director.films_art_directed M3 .
FILTER ( ?x0 != ?x1 )
}