Was a Mexican film producer whose child wrote M0 and M1 M2
SELECT count(*) WHERE {
?x0 ns:film.writer.film M0 .
?x0 ns:film.writer.film M1 .
M2 a ns:film.producer .
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.0b90_r
}