Recently, both Lucy and Darcie O'Sullivan competed in and won events at the NSW Police and Emergency Services Equestrian Games, held in Camden at the end of October.
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But that is only part of the story of these two Yass High School students.
Lucy's success was the perfect way to end a year which had begun with a horrifying injury.
In December 2018, the 14-year-old was riding Bobby Dazzler, a horse recently acquired by the family, who was unbroken.
In a freak accident, the horse had a fall, and Lucy, who was riding him at the time, suffered severe concussion, a broken and dislocated jaw, and three broken vertebrae.
After she was airlifted to Westmead Hospital, and several surgeries, Lucy made a full recovery and returned to eventing.
Despite her recent injuries, Lucy could not wait to get back in the saddle.
"She's been pretty good, actually," the girls' mother, Glynese, said.
"As soon as she got the neckbrace off, she was keen to get competing again.
"She's done remarkably well with this grey horse, who's been a bit notoriously difficult, but he's done really well for her."
When Lucy regained her fitness and Darcie had gotten past the shock of her sibling's injuries, the girls impressed at the games.
Lucy placed first in the junior division for three dressage tests and an 80cm show jump, and won her two riding classes in the hack show.
Her highlight of the weekend came when she beat her adult competitors to win the 80cm eventing.
Darcie won the junior division in one dressage test and came second in the other. She then came away with 12 medals, after winning all the Western Youth Classes, Champion Western Youth Horse and Reserve Champion Western Novice Horse.
This saw her take out the Highest Individual Point Score over the whole weekend.
Glynese was thrilled with the efforts of both of her daughters.
"Eventing is a really tough competition ... to get every single phase right without making any mistakes is really hard," she said.
"[Lucy] just wanted to walk away from every phase being happy with how she'd gone.
"Darcie [who rode Bobby Dazzler], her results were very exciting all-round.
"The fact that this horse had this big turnaround to come from nothing and now he's winning all sorts of things, that's really exciting."
It was a particularly impressive effort from Darcie, who Glynese said was shaken by her younger sister's accident.
"The accident with Lucy with this same horse, that's played on her mind a little bit," she said.
"That's meant she's more of a nervous rider and she doesn't usually go and do as many competitions. She prefers the fun side of things and has enjoyed the journey with this horse.
"That's been a big learning process for her, and she's loved it."