Was M2 written by M1 's child and written by a sibling of M0
SELECT count(*) WHERE {
?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:people.person.parents|ns:fictional_universe.fictional_character.parents|ns:organization.organization.parent/ns:organization.organization_relationship.parent M1 .
FILTER ( ?x0 != M0 ) .
M2 ns:film.film.written_by ?x0 .
M2 ns:film.film.written_by ?x1
}