Mia Tindall joins Zara and her sister Lena in the horse trials in Gloucestershire

Game time! Mia Tindall, four years old, joined her mother at the Horse Trials of Whately Manor International in Gloucestershire today. She was seen having fun while her mother competed

Mia Tindall, four years old, threatened to eclipse her mother when she joined her in the horse trials today.

Naughty Mia, Zara's oldest daughter and Mike Tindall, spent the day with her mother, grandmother Princess Anne and her two-month sister Lena at The Whately Manor International Horse Trials in Gloucestershire.

Former Olympic player Zara, 37, competed in the event, but Mia seemed indifferent to her mother's sporting efforts and preferred to play on the grass.

Game time! Mia Tindall, four years old, joined her mother at the Horse Trials of Whately Manor International in Gloucestershire today. She was seen having fun while her mother competed

Game time! Mia Tindall, four years old, joined her mother at the Horse Trials of Whately Manor International in Gloucestershire today. She was seen having fun while her mother competed

Taking time: after playing, Mia sat down and bit her sunglasses without noticing

Taking time: after playing, Mia sat down and bit her sunglasses without noticing

Taking time: After playing, Mia sat down and bit her sunglasses

Bursting with energy: the young royal smiled radiant as she picked up a crop of horses and carried across the field, as if pretending it was a javelin, in the photo, in the trials with horses today

Bursting with energy: the young royal smiled radiant as she picked up a crop of horses and carried across the field, as if pretending it was a javelin, in the photo, in the trials with horses today

Bursting with energy: the young royal smiled radiant as she picked up a crop of horses and carried across the field, as if pretending it was a javelin, in the photo, in the trials with horses today

Later, Mia Tindall was seen boarding the car with her grandmother, Princess Anne, 68, while a curious pit bull terrier poked her head out the back window.

Later, Mia Tindall was seen boarding the car with her grandmother, Princess Anne, 68, while a curious pit bull terrier poked her head out the back window.

Later, Mia Tindall was seen boarding the car with her grandmother, Princess Anne, 68, while a curious pit bull terrier poked her head out the back window.

The royal girl beamed as she picked up a crop of horses and charged across the field, as if pretending it was a javelin.

She was also seen playfully placing a towel over her head, much to the delight of the woman who was watching her.

After all the fun, it was time for a break and Mia collapsed onto the grass, where she was absent-mindedly chewed on the arm of her fashionable sunglasses.

Mia wore a white skirt and a gray hooded sweater, with a pair of gray booties that proved to be a practical choice for her day of activities.

Family time: Lena, Zara Tindall's baby, is performed today by her friend Dolly Maude, a bridesmaid at her wedding, while royalty competed at The Whately Manor International Horse Trials

Family time: Lena, Zara Tindall's baby, is performed today by her friend Dolly Maude, a bridesmaid at her wedding, while royalty competed at The Whately Manor International Horse Trials

Family time: Lena, Zara Tindall's baby, is performed today by her friend Dolly Maude, a bridesmaid at her wedding, while royalty competed at The Whately Manor International Horse Trials

Hide and Seek? Mia made her mentor laugh while covering her head with a towel

Hide and Seek? Mia made her mentor laugh while covering her head with a towel

Hide and Seek? Mia made her mentor laugh while covering her head with a towel

Ready to go! Mia did not seem to want to fix her hair after playing, in the photo

Ready to go! Mia did not seem to want to fix her hair after playing, in the photo

Ready to go! Mia did not seem to want to fix her hair after playing, in the photo

A blue quilted spangle with fluorescent pink piping was superimposed on top as automatic cooling settled.

Today also marked the first public outing for his little sister Lena, who was born in June.

He imagined Lena being held by Mrs. Tindall's friend, Dolly Maude, a bridesmaid at her wedding, while royalty competed in horse trials in Gloucestershire.

It occurred when Mrs. Tindall spoke today of the anguish of having two miscarriages with her husband Mike, in an emotional and revealing interview.

What's out there? Mia reviewed the competition in the Whately Manor horse tests today

What's out there? Mia reviewed the competition in the Whately Manor horse tests today

What's out there? Mia reviewed the competition in the Whately Manor horse tests today

Mia, four years old, is seen sitting in the car with Grandmother Princess Anne as she rests from a day full of action at the horse races in Gloucestershire.

Mia, four years old, is seen sitting in the car with Grandmother Princess Anne as she rests from a day full of action at the horse races in Gloucestershire.

Mia, four years old, is seen sitting in the car with Grandmother Princess Anne as she rests from a day full of action at the horse races in Gloucestershire.

The former Olympic player spoke about the impact that both deaths had on the couple, in their first televised interview about their double loss.

Speaking about miscarriages, he told BBC breakfast presenter Sally Nugent: "I think that's the hardest thing in our situation, it's that everyone knew.

"And when things like that happen, it's usually just your family and friends, but unfortunately everyone knew it.

"Actually, I had so many letters saying 'I'm so sorry, we've been through the same', which was amazing, and thanks to all those people.

Back to the horse: Zara prepares to participate in an event at the Gloucestershire horse trials

Back to the horse: Zara prepares to participate in an event at the Gloucestershire horse trials

Back to the horse: Zara prepares to participate in an event at the Gloucestershire horse trials

Growing family: Mia with her parents Mike and Zara Tindall at an Oxfordshire festival in August 2016. The couple welcomed a second daughter, Lena, in June of this year.

Growing family: Mia with her parents Mike and Zara Tindall at an Oxfordshire festival in August 2016. The couple welcomed a second daughter, Lena, in June of this year.

Growing family: Mia with her parents Mike and Zara Tindall at an Oxfordshire festival in August 2016. The couple welcomed a second daughter, Lena, in June of this year.

"But it just showed how often it happens and I have a very supportive family, Mike is amazing, and it's also hard for the guys."

She continued: "It's very different for us because we take the girl, but for the boys I think it's a kind of sense of helplessness, which must be incredibly high and horrible for them." At the end of the day, they still lost a child. "

The equestrian champion, who won the BBC Sports Personality of the Year in 2006, revealed for the first time to a newspaper in July that she had suffered two spontaneous abortions before having her second child.

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