Flight from NRT to TPE, flight delayed, then some Taiwan parents did nothing to control their infant. Four adults in the family, two kids, one of which was an infant, screaming for the entire duration of the four hour flight. Flight crew did nothing. Parents and Grandparents did very little. Infants DO NOT BELONG on flights, period! Selfish parents bringing their infants with them on vacation, what is the point? Seriously? And this all was in Business class!! I paid extra for my seat so I don't have to deal with this garbage, unfortunately both airlines and parents take no responsibility for this issue. BAD! Just really bad!