Was a parent of M3 a British female film editor
SELECT count(*) WHERE {
?x0 a ns:film.editor .
?x0 ns:people.person.children|ns:fictional_universe.fictional_character.children|ns:organization.organization.child/ns:organization.organization_relationship.child M3 .
?x0 ns:people.person.gender ns:m.02zsn .
?x0 ns:people.person.nationality ns:m.07ssc
}