Well her family aren’t peasantry - they owned ancestral properties and hosted the royal family.
https://en.m.wikipedia.org/w/index.php?title=Middleton_family&wprov=rarw1
This idea she is working class is part of the fairytale marriage myth making.
Her parents have also been elevated to a higher status of nobility by virtue of her marriage. She herself changed social status through her marriage and her husband’s change in the line of succession more than once.
The royal family has a social order and ranking based on succession (to the extent we’ve heard multiple stories of 2nd sons or occasionally daughters spending their entire lives stewing in resentment) but they can completely divorce that when looking at people who are their ‘subjects’? Ok.
People seem really hung up on this word peasant. Tough, it’s what the vast majority of the world is. The idea it’s associated with idiocy is an example of elitist snobbery which is what I was conveying in my original comment while implying the irony that for all their expensive tax-paid education the BRF are total philistines. I’ve made a similar joke about Andrew putting his cigs out on their personal Rembrandts before.
If you don’t like the word peasant why not substitute it with subjects? Taxes are still paid to the royal family for the upkeep of their personal property because the British are their subjects and are subject to the crown. Even if you no longer work in a field it’s still fuedalism.