Prince Georgehad a memorable “you can’t sit with us” moment with his cousin, Savannah Phillips.

One day after Savannahshushed Georgeon the Buckingham Palace balcony during theTrooping the Colourflypast, the cousins cheered onPrince Williamat hischarity polo matchin Gloucester, England.

During the playdate, which included running around the field and playing with a Slinky, the 7-year-old daughter of William’s cousinsPeter and Autumn Phillipsplayfully pushed George, 4, down a hill when he attempted to sit next to her.

Savannah Phillips and Prince George.Karwai Tang/WireImage

Maserati Royal Charity Polo Trophy

Also during the polo event, Savannah was spotted ruffling George’s hair when he wasn’t looking. While she had some fun teasing the future heir to the throne,Queen Elizabeth‘s great-granddaughter appeared to show more affection to Princess Charlotte.

“[Savannah] sat with Charlotte in her lap,” an observer told PEOPLE. “She hugged her and balanced her on her knee.”

But George also hadsome fun on his own.

“He leapt right into it. The first thing they did when they left the car was slide down the hill on his bum,” the onlooker said. “He was peering over some hoarding around the side of the pitch, grinning at the others, who were messing around with him.”

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George’s push down the hill comes after Savannah wanted her cousin to keep it cool on the Buckingham Palace balcony when she promptly placed her right hand right over his mouth when he started to giggle.

Trooping the Colour 2018.James Whatling/MEGA

Trooping the Colour 2018

source: people.com