You probably don't need to hear it again....but...how so normal for a kitten! He probably was a bit shy when you got him, or small, and now has his game on. I look at people like they are nuts when they say, "I love kittens, but not cats". Geesh. Give me a junior cat any day. Kittens are tough...like toddlers..into the world. But, constant redirection of energy- especially the biting,clawing, etc., PLUS another kitten will help. Kittens learn their limits when with other kittens. They learn what is too hard of a bite, rough play (well, for the most part) by the other kittens reaction. Please wait out this rough period, and discourage your kids from rough housing with the kitten. Can't wait to hear the first time Kitty climbs the drapes or shower curtain! Good luck.