Kate MiddletonandPrince Williamtook their two eldest children to the Burnham Market international horse trials in Norfolk – not far from their country home Amner Hall, on the Sandringham estate – over the weekend, where they hung out with William’s first cousinZara Tindalland her family.
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Prince Louis, who will turn 1 this month, appeared to stay home, but Mike and Zara’s 9-month-old daughter Lena made an appearance. The older kids occasionally peered over to her stroller to check in.
Mia got competitive with her cousin of the same age, appearing to measure her height against his while hanging out at the annual equestrian event.
George and Mia have been playing together at polo matches, family gatherings and summer weddings since before they could walk. Nearly four summers ago, they were the center of attention at a polo game at Beaufort Park club, in Gloucestershire, when George – clutching a toy tractor – and Mia were among cousins playing on a grassy bank.

More recently, George, Mia and Charlotte were all in the bridal party atPrincess Eugenieand Jack Brooksbank’s October wedding.
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George and Charlotte, who turns 4 on May 2, also enjoyed rides, slides and a turn in bumper cars as Zara, who won a silver medal in equestrian competition at the 2012 Olympics, competed at this year’s event.

Mia Tindall, Isla Phillips and Savannah Phillips.Anwar Hussein/WireImage

When Zara competed in the Gatcombe Park Horse Trials last month, many members of the royal familystepped out to cheer her on. It turned into weekend-long fun for Mia and first cousins Savannah Phillips, 8, and Isla Phillips, 6. The girls were all smiles as they chased each other in the grass and pet dogs, then cooled off with some ice cream.
And doting big sister Mia made sure to check on little Lena periodically.
source: people.com