I am not Argentinean, but I live here for more than 20 years. Buenos Aires is a safe city. Of course, now things have changed, so it would be easier if you and your family live in Recoleta or Palermo area. Local people, portenios, talk too much about how dangerous and risk the city is now, but it is not real. Buenos Aires has a big population, and I am sure there are more than one hundred thieves, but in general terms is pretty safe. During summer time you will see people walking at 2 AM, even more children at Mc Donald's playground at 1AM. So, do you really believe is this a risky place? Be more carefully about real state people hehehe, make a good research before you make any commitment. And WELCOME TO BUENOS AIRES