I think it's good to include kids, don't know why people have such a problem with them. One of my faves is Cheeky Monkeys, a dancing duo from a few years back, they are obviously grown up now.
From this year, I have loved Gracie Wickens Sweet - such a lovely girl and with such a stunning voice for her age, plus she sang Over The Rainbow and Reflection, two of my fave songs. Also loved Maia Gough, not many people can sing Whitney the way she did. Also loved Groove Thing and not sure if Isaac Waddington is classed as a 'kid' coz he's 15 but I loved his voice.