The royal couple wish to keep their children “down to earth” and have “taught them to be graceful”, the source added.
The insider said: “[They keep them] well away from social media.
“Kate and William will not allow them to have accounts, even secret ones.
“They 100 percent disagree with young children having social media accounts.”
The royal insider told Us Weekly that the Duke and Duchess of Cambridge have made George, 8, Charlotte, 6, and Louis, 3, “aware of their privileges”.
They added: “[They have] taught them to be graceful…they don’t boast about their positions or have superiority complexes.
“[They] treat their peers with kindness and as equals.”
The same source revealed some more about what the Cambridge children get up to away from the spotlight.
Princess Charlotte is apparently very academic and even enjoys doing her homework.
The insider added: “Charlotte is sharp and bright as a button. She is top of her class at reading.”
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“And I have to, now, basically prioritise that one day someone does this one and another day it’s someone else’s turn.”
However the chaos in the royal household comes with plenty of fun for the children as well.
William continued: “Charlotte, particularly, is running around the kitchen in her dresses and ballet stuff and everything.
“She goes completely crazy with Louis following her around trying to do the same thing.
“It’s a really happy moment where the children just enjoy dancing, messing around and singing.”