"Every pristine item of their clothing would have a beautifully sewn-in name tape, for instance.
"There were huge picnics at sports day; the smartest tennis rackets, that kind of thing.
"It made other families feel rather hopeless."
The pair no doubt owed their enviable appearance to their mother Carole Middleton, who is described as very "family-minded" by a friend.
"The thing that no one seems to get about Carole is how cosy she really is. Yes, she looks quite intimidating, but no one could be more family-minded. More of homebody".
The Duchess of Cambridge was also a keen netball player and played in the first pair at tennis when she attended Marlborough College during the 1990s where she was also an A-Grade pupil.
Other notable alumni include Princess Eugenie, Samantha Cameron, the Prime Minister's wife, Poet Laureate Sir John Betjeman and Captain Mark Phillips.