Sure - anyone can try to stay in Canada illegally. How long that works for them is impossible for any of us to guess.
However if you go back and re-read the OP's posts, you'll see the parents in this case are under the very mistaken impression they can stay and work in Canada legally as a result of having a Canadian citizen child.
However if you go back and re-read the OP's posts, you'll see the parents in this case are under the very mistaken impression they can stay and work in Canada legally as a result of having a Canadian citizen child.