Was M3 a person whose Italian sibling edited M0 and M1
SELECT count(*) WHERE {
?x0 ns:film.editor.film M0 .
?x0 ns:film.editor.film M1 .
?x0 ns:people.person.nationality ns:m.03rjj .
FILTER ( M3 != ?x0 ) .
M3 a ns:people.person .
M3 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
}