Did M4 employ a Canadian actor whose sibling played M2 and M3 and employ M5 and M6
SELECT count(*) WHERE {
?x0 a ns:film.actor .
?x0 ns:people.person.nationality ns:m.0d060g .
?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 ?x1 .
?x1 ns:film.actor.film/ns:film.performance.character M2 .
?x1 ns:film.actor.film/ns:film.performance.character M3 .
FILTER ( ?x0 != ?x1 ) .
M4 ns:business.employer.employees/ns:business.employment_tenure.person ?x0 .
M4 ns:business.employer.employees/ns:business.employment_tenure.person M5 .
M4 ns:business.employer.employees/ns:business.employment_tenure.person M6
}