\"She loves it and it's a great way to introduce her to a sport,\" MacCurtain said, adding that Abby did her first triathlon at 5 years old.

In the first leg of races, the swim, MacCurtain swims while Abby sits in a one-person, inflatable kayak as her dad's firefighter colleagues act as her safety spotters.

View this post on Instagram

A post shared by Team Abby Mac (@team_abby_mac) on Aug 23, 2019 at 10:38am PDT

\"PHOTO:
Light Minded Photography/Allan Litchfield
PHOTO: Abby MacCurtain, 9, and her dad Greg MacCurtain of Plymouth, Massachusetts, participate in triathlons together.
>

In the second part, the bicycle race, Abby is harnessed into a 7-foot long bike.

In the last leg, Abby uses a Hoyt running chair. The device makes it easier for her to be included in athletic activities.

When she's not racing, Abby enjoys being with her family.

View this post on Instagram

A post shared by Team Abby Mac (@team_abby_mac) on Oct 6, 2019 at 5:46am PDT

\"She's extremely happy all the time with people,\" MacCurtain said. \"She's happy with her parents. She loves her brother and she loves school.

\"One day all we're going have left is memories, unfortunately,\" he added. \"When she was first diagnosed they gave two years for her to live and she just turned 9 over the winter. She's pretty much exceeding all expectations.\"

MacCurtain shares Abby's journey through photos and videos of her and Tomas' special bond on social media.

\"PHOTO:
Greg MacCurtain
PHOTO: Viewers were moved in May 2020 by a heartwarming video of 8-year-old Tomas MacCurtain helping his sister Abby MacCurtain, 9, slam dunk a basketball. Over 8 million watched after dad Greg MacCurtain posted the footage of his kids onto Facebook.
>
View this post on Instagram

A post shared by Team Abby Mac (@team_abby_mac) on Nov 2, 2019 at 11:05am PDT

\"They're amazing kids,\" MacCurtain said. \"There's things that are not teachable and that's definitely [with] Tomas. How do you teach such kindness? He's got a great heart. They both do.\"

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