What to get 9 year olds for Christmas?

Aimee

I don't have children, so I have no idea what kids want. My brother has twins (9 years old, 3rd grade), one boy and one girl. My brother tends to be useless in telling me what they want. I like being the "cool aunt" that spoils them. What do 9 year olds want? They're at an age where idk if they want toys, or more grown up stuff. I'm guessing maybe electronics? I have no clue. Please tell me what items are popular amongst that age category.