Did M2 employ a person and employ M1 's art director 's sibling
SELECT count(*) WHERE {
?x0 a ns:people.person .
?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 ns:film.film_art_director.films_art_directed M1 .
FILTER ( ?x1 != ?x2 ) .
M2 ns:business.employer.employees/ns:business.employment_tenure.person ?x0 .
M2 ns:business.employer.employees/ns:business.employment_tenure.person ?x1
}