source gave rare insight to the outlet about what Kate's life off-duty is like.

"Family means everything to the mom of three, and one of her biggest worries about the future is not being there for George, Charlotte, and Louis," the source said. "George is well-behaved. All the kids are, but Charlotte and Louis both have a cheeky streak. Louis is more like Charlotte in personality than George!"

When Kate isn't working, the duchess loves practicing yoga and also "loves doing things like cooking for the kids and planting seeds with them in the garden," the source said.

Kate spoke a little about her life with the kids in quarantine during a BBC interview in April. "Children have got such stamina," she said. "I don't know how, honestly. You get to the end of the day and you write a list of all the things you've done in that day. You've pitched a tent, take the tent down again, cook, bake, you get to the end of the day. They've had a lovely time. It's amazing how much you can cram into one day, that's for sure."

She also alluded to Louis' cheeky side when discussing how the kids do video calls with other members of the family. "It gets a bit hectic, I'm not going to lie," she said. "With a two-year-old you have to take the phone away. It's quite hectic for them all to say the right thing at the right time without pressing the wrong buttons. But it's great and it's nice to keep in touch with everybody."

Us also got insight from a source about Kate's royal ambitions. “Kate may change some of the outdated royal rules when she becomes queen [consort],” that source said, although the source didn't specify what outdated royal rules she wanted to change.