Was M1 M0 's writer 's Mexican child
SELECT count(*) WHERE {
?x0 ns:film.writer.film M0 .
M1 ns:people.person.nationality ns:m.0b90_r .
M1 ns:people.person.parents|ns:fictional_universe.fictional_character.parents|ns:organization.organization.parent/ns:organization.organization_relationship.parent ?x0
}