Your Kid, Your Best Mirror

Your kid is your best mirror to be reflected upon. 
 - You can discover your old forgotten bad habits in him
 - He can teach you what lead by example means for he would emulate your behavior more than he would listen to your words, so you better practice what you preach
 - Last but not the least, he can make you dumbstruck with his unbiased question to your subconsciously/unconsciously biased conclusion so that you are forced to re-evaluate your conclusion...