What was the prompt for this essay?
Because all parents think their children are special, an essay reflecting this bias is not too informative and probably not what the school was trying to elicit. If the essay comes off as bragging about your child, you missed the point of the essay IMO.
http://talk.collegeconfidential.com/prep-school-admissions/2052199-parent-response.html
http://talk.collegeconfidential.com/prep-school-admissions/1905957-parent-statement-length-p1.html
http://talk.collegeconfidential.com/prep-school-parents/1748231-the-parentss-statement-in-the-application.html