Mariah Carey is about to embark on her annual Christmas tour and it looks she is teaching her twins the background vocals for All I Want for Christmas (Is You). Now that Roc and Roe are 7 years old, instead of joining her on stage; it is about time they started earning their keep. Why not have them sing along with her to earn their supper. Plus, the audience will love it. It is a win/win for everyone, but the child labor department that might have to fine her for doing that. Can she put them to work legally?