Were M1 , M2 , M3 , and M4 employed by a child of a production company
SELECT count(*) WHERE {
?x0 ns:people.person.parents|ns:fictional_universe.fictional_character.parents|ns:organization.organization.parent/ns:organization.organization_relationship.parent ?x1 .
?x1 a ns:film.production_company .
M1 ns:people.person.employment_history/ns:business.employment_tenure.company ?x0 .
M2 ns:people.person.employment_history/ns:business.employment_tenure.company ?x0 .
M3 ns:people.person.employment_history/ns:business.employment_tenure.company ?x0 .
M4 ns:people.person.employment_history/ns:business.employment_tenure.company ?x0
}