Which Starbucks coffee have the least amount of caffeine? I like coffee, my mom likes coffee, my dad likes coffee, and we all love Starbucks. My question is, which coffe has the least ammount of caffeine?

I want to try to get one for my little sister :) (she's 10) 

So what coffee at Starbucks has the least amount of caffeine?
Very probably any single-shot espresso beverage (tall Americano or latte?) prepared with decaffeinated beans or the regular decaffeinated filtered coffee is a good choice of you are looking for the coffee flavor but not very fond of caffeine.