Was M1 a film 's prequel 's editor 's American sibling
SELECT count(*) WHERE {
?x0 ns:film.editor.film ?x1 .
?x1 ns:film.film.sequel ?x2 .
?x2 a ns:film.film .
FILTER ( M1 != ?x0 ) .
M1 ns:people.person.nationality ns:m.09c7w0 .
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
}