Gracias Señoritabella!!
I did mention in our application that I lived in the US for 3 years as a teenager with the full information on dates, address and studies. I don´t recall indicating I had been in that specific situation in 1990 as I never considered that a crime, in my view we were just detained. We were allowed to live in US legaly, my family decided to return voluntarily.
I have many entries to the US the last couple of years (for work), I even had my US visa renewed 2 weeks ago.
I trust CIC considers that I was not under my oun judgement in those years, when I was 15 years old, I was follwing my parents ideas...
Regards!