In case someone else has the same question, CRA told me that I have to add the T3 to my return because the ITF account is under my SIN. When my son turns 18, I will have to move the account to his name and SIN and then he would claim whatever results from it. Feel so dumb, I only looked at the names and totally neglected to look at the SIN on record on the slip. Oh well, better to know than guess.
