Were M3 and M4 founded by a Mexican film editor whose Mexican sibling edited M2
SELECT count(*) WHERE {
?x0 a ns:film.editor .
?x0 ns:people.person.nationality ns:m.0b90_r .
?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.editor.film M2 .
?x1 ns:people.person.nationality ns:m.0b90_r .
FILTER ( ?x0 != ?x1 ) .
M3 ns:organization.organization.founders ?x0 .
M4 ns:organization.organization.founders ?x0
}