As for the grade; in QP you might find a Ph.D holder with 25 years experience in Grade 15 and another with B.Sc. with 10 years experience in higher grade.
However, it is not about the Job grade as it is related to the Job not to your qualification and it's up to you to apply to this position or not.
Note that the salary grade doesn't have to match with the Job grade (wthin limits) and you have a space to bargain if you're not desperatefor thejob.
More important than all what's discussed here is your children life. If they were raised in Canada (not Arab immigrants), it will be extremely unfair to them to bring them here for only hanging out in the malls and eating.