question: What was executive produced by M0 , M1 , M2 , and M3 and written by a production company 's child 's employee
query: SELECT DISTINCT ?x0 WHERE {
  ?x0 ns:film.film.executive_produced_by M0 .
  ?x0 ns:film.film.executive_produced_by M1 .
  ?x0 ns:film.film.executive_produced_by M2 .
  ?x0 ns:film.film.executive_produced_by M3 .
  ?x0 ns:film.film.written_by ?x1 .
  ?x1 ns:people.person.employment_history/ns:business.employment_tenure.company ?x2 .
  ?x2 ns:people.person.parents|ns:fictional_universe.fictional_character.parents|ns:organization.organization.parent/ns:organization.organization_relationship.parent ?x3 .
  ?x3 a ns:film.production_company
  }