Were M1 , M2 , M3 , and M4 directed by a parent of M0 's art director
SELECT count(*) WHERE {
?x0 ns:people.person.children|ns:fictional_universe.fictional_character.children|ns:organization.organization.child/ns:organization.organization_relationship.child ?x1 .
?x1 ns:film.film_art_director.films_art_directed M0 .
M1 ns:film.film.directed_by ?x0 .
M2 ns:film.film.directed_by ?x0 .
M3 ns:film.film.directed_by ?x0 .
M4 ns:film.film.directed_by ?x0
}