Master Archie Harrison Mountbatten-Windsor is fitting in swimmingly with the rest of his royal family! We're learning more about the bonding between the Duke and Duchess of Sussex's 2-month-old son and his cousins. Archie was seen out and about with mom Meghan Markle, aunt Kate Middleton, and Kate's children. The family got together to watch as William and Harry participated in King Power Royal Charity Polo Day.
The day of the charity polo event also marked the first time Archie spent time with all three of the Cambridge kids, according to the Sun's royal correspondent, Emily Andrews. William and Kate, on the other hand, met Archie about a week after he was born, at Frogmore Cottage.
Now that the baby boy has spent some time getting to know his cousins, they're immediately growing fond of the little guy. It's so sweet to see George, Charlotte, and Louis welcoming their cousin Archie into the family.
Prince George and Princess Charlotte are enjoying being the big kids in the royal family. The Duke and Duchess of Cambridge's two oldest kids are getting to enjoy spending time with younger kids; between 1-year-old brother Prince Louis and 2-month-old cousin Archie, they're loving being the cool big kids.
Prince George recently celebrated his sixth birthday, while Charlotte turned 4 in May. The two are getting along better than ever. "Charlotte’s a bit of a tomboy and loves climbing and sports," a source tells Us Weekly. "Although Charlotte’s much bossier than George, she looks up to him. They squabble over small things like toys, but the majority of the time they get along."
The siblings have also learned to include their little brother in their fun. "The three of them 'have a blast playing together,'" the source says. George and Charlotte love to find new ways to "include him in their activities."

Now the Cambridge kids have a new little one to include in their fun. The source revealed that since meeting Archie, George and Charlotte have become quite fond of their new baby cousin. "They dote on him," the source revealed.

It's unclear exactly when baby Archie first met his cousins — some sources say he met them at the Trooping the Colour celebration, while others say they didn't meet until the King Power Royal Charity Polo Day.
During the polo tournament, both Harry and William were playing polo in the event, leaving Meghan, Kate, and the kids to hang out together and watch.
Charlotte is particularly fond of looking out for her little cousin, according to the source. "Charlotte treats Meghan and Harry’s son like a little doll and is always asking after him," the source revealed. It's so sweet of Charlotte, who must have gotten a lot of practice with Louis.
Archie has also met some other members of the family. Despite the fact that he didn't appear publicly, he actually was at Trooping the Colour in June, Us Weekly revealed. Meghan and Harry didn't want to be too far from the little one and wanted to give him a chance to meet some members of the family.
"Archie was at Trooping the Colour," the source said. "[It] was a chance for him to meet some of his cousins." It's understandable that the couple didn't want to bring the 1-month-old out on the balcony at the busy celebration.
Meghan and Harry even had to dip away so that Meghan could feed Archie. The source explained, "The reason Harry and Meghan didn’t appear on the balcony when the Queen returned back to Buckingham Palace was because she was breastfeeding."

While Meghan was missing her little boy every moment she was away from him, she did enjoy seeing the rest of the kids. "She has spent almost every moment with him and saying goodbye was very difficult," explains the source. "But Meghan truly wanted to be at the celebration for the queen. … Meghan loved seeing all the other royal children and was doting on them."
It's wonderful to see that Meghan is becoming more comfortable at royal functions. Archie will certainly be a big part of that as time moves forward. Meghan and Harry may want a more private life for Archie than his cousins will have, but that won't get in the way of the bond between the kids.
Since Archie's birth, there also seems to be an end to the idea of the Cambridges and the Sussexes feuding. Certainly, parenthood is an arena in which the two couples can bond, even if their views on other issues don't always match up.
Meghan, Harry, and Archie have a big few months ahead of them. The Sussexes will embark on their first royal tour as a family this fall when they head to South Africa. Since the African continent holds so much meaning for Harry and Meghan, it will surely be a place where memories are created for the family.
The Cambridges have something big ahead of them this fall as well. Charlotte will be joining George at Thomas's Battersea when school is back in session. She previously attended Willcocks Nursery School, but she's moving up. It's an exciting time for all the royal kids as they continue to grow and come into themselves.