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Crazydre
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For Mexico:

As per Timatic, the database used by Airlines:

Passport Exemptions:

Nationals of Mexico with a:

  • national ID card; or
  • certified copy of birth certificate; or
  • consular registration; or
  • certificate of Mexican nationality; or
  • naturalization letter; or
  • Matricula Consular; or
  • Constancia de Identificacion; or
  • voter's certificate with photo.

Any of These, in other words, are accepted for entry to Mexico.

So no, your children do not need Mexican passports to enter Mexico, even by air

For the US:

As per Timatic:

Passport Exemptions:

  • Passengers with a Transportation Letter.
  • Passengers with an emergency or a temporary passport.

So to enter the US by air, they do need US passports.

By land, however, US passport cards and enhanced state ID cards are valid too, as well as possibly other IDs that I'm unaware of

Crazydre
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