question: What screenwriter whose employer employed M2 and employed M3 , M4 , M5 , and M6 was M0 's sibling
query: SELECT DISTINCT ?x0 WHERE {
  ?x0 a ns:film.writer .
  ?x0 ns:people.person.employment_history/ns:business.employment_tenure.company ?x1 .
  ?x0 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 M0 .
  ?x1 ns:business.employer.employees/ns:business.employment_tenure.person M2 .
  ?x1 ns:business.employer.employees/ns:business.employment_tenure.person M3 .
  ?x1 ns:business.employer.employees/ns:business.employment_tenure.person M4 .
  ?x1 ns:business.employer.employees/ns:business.employment_tenure.person M5 .
  ?x1 ns:business.employer.employees/ns:business.employment_tenure.person M6 .
  FILTER ( ?x0 != M0 )
  }