Hi Jaidan, I'm Canadian as well and have been living here for the past 4 years. Our son is now 2.5 and was born here.
Just a few quick things that haven't been covered by others before:
- You will have to adapt to the way you are raising your children: schedule is very different (kids stay up late, rarely nap, tweens from 11 year olds have parties that START at 9pm, etc), the amount of sugar your kids get offered daily is madness, etc. But otherwise, it's a great place to be with kids. I love that we can take our kid to any restaurant and people react well.
- I wouldn't worry about the school being bilingual honestly, you'll be speaking to your kids in English and they would most likely be bored in the English classes anyways as they would be much better than the other kids. If you were here longer-term it might make sense, but for only a year, it's not necessary.
- Count in at least 2500 pesos of healthcare monthly, unless you contract an Expat international company for a flat year fee of around 2000 US (but this only covers accidental while a local one will cover everything including dental). I can recommend some local ones or international ones if you need.
- Unless you want to buy a car (which is a hassle if you're here short term only), I would limit your searches for school/neighboorhood to within Buenos Aires city. Recoleta, Palermo and belgrano (including colegiales, chacarita, etc) would be your best bet for a walkable, park-filled family life.
To give you an idea, we live in Palermo, I walk my son to soccer practice, we bike to his school and all necessities are within 2-3 blocks distance. Public transport wise, anything that is walkable distance to the D subway line is great to connect anywhere in the city. Obviously the big difference in those areas from most of Canada is that it's extremely urban and dense. Few people have access to yards, there are some large parks but definitely not the greenery we're used to.
Good luck!