1) Lincoln School is the only school I know that follows the US calendar. And it's expensive. Annual tuition is about 25K USD per child in grade school. Plus a one time enrollment fee of 10K for each child. So factor in 50K in costs if you choose to go to that school for your 2 kids. It may be worth it if you want to keep your child on the US schedule. Otherwise, plenty of bilingual schools that will be much less. Probably safe to estimate around 10K a month IN PESOS (so less than 1K USD) per child for school.