Was M2 M1 's sequel 's Mexican writer 's American parent
SELECT count(*) WHERE {
?x0 ns:film.writer.film ?x1 .
?x0 ns:people.person.nationality ns:m.0b90_r .
?x1 ns:film.film.prequel M1 .
M2 ns:people.person.children|ns:fictional_universe.fictional_character.children|ns:organization.organization.child/ns:organization.organization_relationship.child ?x0 .
M2 ns:people.person.nationality ns:m.09c7w0
}