Was M3 written by a British sibling of M1 and executive produced by a person
SELECT count(*) WHERE {
?x0 a ns:people.person .
?x1 ns:people.person.nationality ns:m.07ssc .
?x1 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 M1 .
FILTER ( ?x1 != M1 ) .
M3 ns:film.film.executive_produced_by ?x0 .
M3 ns:film.film.written_by ?x1
}