question: Was M1 a person 's parent and sibling
query: SELECT count(*) WHERE {
  ?x0 a ns:people.person .
  FILTER ( M1 != ?x0 ) .
  M1 ns:people.person.children|ns:fictional_universe.fictional_character.children|ns:organization.organization.child/ns:organization.organization_relationship.child ?x0 .
  M1 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 ?x0
  }