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