Kiddie coasters aren't intense, have cramped vehicles, last 30 seconds, and are for the 5 under crowd. (IE The Barnstormer, Flight of the Hippogriff).
Family coasters aren't too intense, have comfy vehicles, last at least 1 and a half-2 minutes, and is something the whole family will enjoy (IE Big Thunder).
Since SDMT doesn't qualify for the kiddie coaster class, it will be a family coaster.