That being said, royal expert Katie Nicholl told ET that they made a decision to put their differences on hold during the holiday season.
Here's the nickname Middleton called both of her children while they were out and about, plus some other nicknames different members of the royal family have for each other.
Last year, Meghan had protocol pro Kate Middleton by her side to show her the ropes as she gave a demure smile and did a slight curtsy.More news: Magnitude 4.8 natural disaster in Italy causes damages, injuries
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One shopper said: "I recognised little Prince George holding Kate's hand and Charlotte with a red bow in her hair".
People shouted "Merry Christmas" to the royal party as they went by and later the Sussexes and Cambridges greeted people, accepting gifts of flowers and chatting to people.
The Duchess of Sussex reached for her bump and said, "We're almost there", when asked by Ms Anvil if she was excited about her baby, which is due in spring. "Her bump holding was pure instinct, natural and not staged at all".
The Duke and Duchess of Cambridge and Duke and Duchess of Sussex led the way with the Prince of Wales.
Meghan Markle is really experimenting with fashion while pregnant. The Prince of Wales calls the former actress "Tungsten", which is inspired by the very strong metal known for its robustness. "As a outcome, his abandoned inner child can hijack the relationship", she explained.