OOOh where to start//?
Because child is a child naturally, wheras a fattie is a fattie because he/she eats too many pies..?
or
A Child has one or two full paying fare adults accompanying or if travelling alone pays extra?
or
A child weighs less than an adult, especial a fattie..?
I'm now opening a personal book on whether F3G says again "this is my last word on the subject..."