just beware very young children in the front in a car seat, they may try to fly with their feet, not too dangerous in the cruise (it will lead to strange looks around when you are drifting along thinking they are asleep and the aircraft performs an unexplained "nod") but obviously something to be aware of on the approach. They will love flying providing they stay awake, as a rule of thumb airsickness is not an issue under four The best thing about flying children in private aircraft is that they can have a go at flying, they are very good at it especially considering they are usually on instruments only due to height. Make sure that they have a headset though as over the years I have had experienced children who would not let go of the controls until they have had an explanation as to why it is important. Also of course it means they can feel even more part of the experience. Don't let their age put you off doing taking them flying but just make sure that you are comfortable with it to start with.