回複：Help - 加拿大技術移民問題

1. Most possibly that they will not ask you to improve your English ability, if they ask, you just need to indicate so and ask your boss, co-worker to write some reference letter for you.

2.& 3. If you are not the guardian of your son, you cannot apply your son as dependent, and you need to put your son as family member, at the same time, you need to provide evidence (docs) that you are not guardian of your son. Since you don't have guardian for your son, you cannot apply for your son.