Did M2 employ a costume designer that a parent of M1 employed
SELECT count(*) WHERE {
?x0 a ns:film.film_costumer_designer .
?x0 ns:people.person.employment_history/ns:business.employment_tenure.company ?x1 .
?x1 ns:people.person.children|ns:fictional_universe.fictional_character.children|ns:organization.organization.child/ns:organization.organization_relationship.child M1 .
M2 ns:business.employer.employees/ns:business.employment_tenure.person ?x0
}