Well as with any other "typical" article these are typical families based on what the writer to believe typical to mean, or what surveys declare as typical. Your results may vary.
The other disclaimer is that in some cultures what would be presented may be what the family itself perceives as what they should present, not what they actually consume. There is always that pressure to conform.
The other disclaimer is that in some cultures what would be presented may be what the family itself perceives as what they should present, not what they actually consume. There is always that pressure to conform.