question: Did M1 , M2 , M3 , and M4 employ M0 's star 's child
query: 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 ns:film.actor.film/ns:film.performance.film M0 .
  M1 ns:business.employer.employees/ns:business.employment_tenure.person ?x0 .
  M2 ns:business.employer.employees/ns:business.employment_tenure.person ?x0 .
  M3 ns:business.employer.employees/ns:business.employment_tenure.person ?x0 .
  M4 ns:business.employer.employees/ns:business.employment_tenure.person ?x0
  }