Were M2 and M3 written by and edited by a Mexican film editor 's child
SELECT count(*) WHERE {
?x0 ns:people.person.parents|ns:fictional_universe.fictional_character.parents|ns:organization.organization.parent/ns:organization.organization_relationship.parent ?x1 .
?x1 a ns:film.editor .
?x1 ns:people.person.nationality ns:m.0b90_r .
M2 ns:film.film.edited_by ?x0 .
M2 ns:film.film.written_by ?x0 .
M3 ns:film.film.edited_by ?x0 .
M3 ns:film.film.written_by ?x0
}