On a LGW-DFW segment last year in Business Class, my mind recoiled in horror when a whole family (Parents, 3 kids about 5/7/10) were upgraded to Business Class not far from me. Actually, I think 3 of them had tickets, don't know the rev/nonrev status though.

Suffice to say, these kids were so well behaved, I complimented the parents when leaving the flight. It really is all in the parents!!!