question: Were M2 , M3 , M4 , M5 , and M6 founded by a film producer whose sibling was employed by and founded M1
query: SELECT count(*) WHERE {
  ?x0 a ns:film.producer .
  ?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 ?x1 .
  ?x1 ns:organization.organization_founder.organizations_founded M1 .
  ?x1 ns:people.person.employment_history/ns:business.employment_tenure.company M1 .
  FILTER ( ?x0 != ?x1 ) .
  M2 ns:organization.organization.founders ?x0 .
  M3 ns:organization.organization.founders ?x0 .
  M4 ns:organization.organization.founders ?x0 .
  M5 ns:organization.organization.founders ?x0 .
  M6 ns:organization.organization.founders ?x0
  }