they're not just ordinary people.. they really are not. the King ... is very far from an ordinary Person.... he really has no clue how a regular person lives...
prince Wiliam tries his best to be a 'common people person'' he learned this from Diana .. he has experienced. normal life at various periods in his life.., going to the pub as a teen at Unniversity , serving as an Air ambulance helicopter pilot, and rescuing people from various situations. Catherine grew up in a middle class household..her mother was a simple airline stewardess... and until and even after she and William married, and before they had children she still shopped for her own groceries in amongs the common people, at the regular supermarket.....
So both of them are aware and have to some extent, mixed with the ordinary joe... but surrounded as they are with riches.. never a concern about how to pay a bill.. or how to afford shoes for their kids... having chefs, and dressers... and completely surrounded by sychophants.. they unfortunately are the closest the RF will ever get to be ''normal'' people like the rest of us..