It really is special when you see your kid swimming around like a fish for the first couple times. Just be aware your mask might get a little wet even if it doesn't have a leak. 

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I have seen a number of kids get their certification but the several instructors I have spoken in the past with seem to prefer the parents not be present as they can be a distraction.obviously i cannot speak for any of the dive shops. but the above statement may not always be the case. i would suggest discussing this with the instructor before you make plans just so you are not surprised and disappointed.
for myself, i rarely allow anyone on site if i have students. but it depends on the course we are doing, the student, and the other divers wanting to tag along.
i am sure whoever you decide to go with you all will have a great time. HAVE FUN !!