question: Was M0 a Mexican spouse and parent of M2
query: SELECT count(*) WHERE {
  FILTER ( M0 != M2 ) .
  M0 ns:people.person.children|ns:fictional_universe.fictional_character.children|ns:organization.organization.child/ns:organization.organization_relationship.child M2 .
  M0 ns:people.person.nationality ns:m.0b90_r .
  M0 ns:people.person.spouse_s/ns:people.marriage.spouse|ns:fictional_universe.fictional_character.married_to/ns:fictional_universe.marriage_of_fictional_characters.spouses M2
  }