IMO most of the posters are being unnecessarily pessimistic about your situation.
Personally, I'm just offering possible scenarios to the OP, not being overly pessimistic. I overstayed by 2 years by the time I applied. I did almost exactly what you're planning on doing. I got my application ready to go and went on vacation to visit my parents in Asia. Husband mailed it while I was out of Canada (and therefore in status at the time of mailing and receipt by CIC).
You were not in status at the time that your application was mailed, because you were NOT in Canada. How can you be in status if you are not in the country?
There's no place in the application where you'd have to state that you overstayed. Just enter the dates you entered and left, no commentary. Obviously, if CIC does the math and checks in their computer for any extensions (and finds none), they'll know you overstayed. Just no need to do the work for them or draw attention to it.
Yes there is. You have to show the status in Canada in at least two places (for example IMM 0008, question 10). The OP would have to select `other', and then type `out of status' in the adjacent box.
Don't worry about your kid. If he was born in 2010, what school are you worried about? Preschool? Missing a few months of preschool (or frankly even all of preschool) isn't going to keep him from getting into the college of his dreams. Just worry about getting your immigration situation sorted.
Excellent advice!
Good luck.
Indeed!