question: What costume designer that M1 and M2 were influenced by and M3 , M4 , and M5 influenced was a person 's sibling
query: SELECT DISTINCT ?x0 WHERE {
  ?x0 a ns:film.film_costumer_designer .
  ?x0 ns:influence.influence_node.influenced M1 .
  ?x0 ns:influence.influence_node.influenced M2 .
  ?x0 ns:influence.influence_node.influenced_by M3 .
  ?x0 ns:influence.influence_node.influenced_by M4 .
  ?x0 ns:influence.influence_node.influenced_by M5 .
  ?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 a ns:people.person .
  FILTER ( ?x0 != ?x1 )
  }