Mods: Children can make Lemonade, Ice Tea and Citrus Fizz on Back Yard Drink Tray by TheTreacherousFox from Mod The Sims.
It lets children use Back Yard Drink Tray completely as adults do.
Kids can mix Lemonade, Ice Tea and Citrus fizz. Also they can restock and make it empty.
Maybe someone needs this type of interaction in the game.