Our little Lady- Not so little anymore?

Our purrfect cat Lady had her first litter a couple of weeks ago- she only had two- although we wanted more she did just great. She had two male cats- one that looks a lot like her and the other has long black hair (his father's trait?). We thought the father was Tiger ( our other cat) but no orange hair in this mix (or does that matter?). Anyway the little guys are just trying to get around and starting to act like kittens. It is all we can do to keep the girls from mauling them with their insatiable energy and love.