"If you say so," Hannah laughed.

"No," Tatyana insisted. "When you look at the track, you know."

Tatyana has more than her own observations to back her claim. At 16, Hannah is the youngest person on the USA track team, and came in third overall at the T54 100-meter dash July qualifiers in Indianapolis, with a time of 17.57 seconds. Tatyana came in first at the qualifiers in that event, with a time of 16.16 seconds.

"She's coming in second place for the Americans, third overall, and some of the girls have been training years and years and years, and she's passing them by," Tatyana said. "You can just see how much talent she has. And if she sticks with it, from now until she's my age, she's going to have significant growth."

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Team McFadden

While the 100 is Hannah's only event, Tatyana is competing in five events: the 100-meter, 400-meter, 800-meter, 1,500-meter and the marathon. The family said they've been told by the International Paralympic Committee that it's the first time in either Paralympic or Olympic history that a runner is competing in those five events, in just one Games.

Tatyana said it's "unheard of, and tough to focus on both," but her mother said she wasn't surprised in the least by her daughter's decision to do everything.

"Tatyana has set goals for herself, and she is achieving what she sets out to do," Deborah McFadden said. "She has a plan."

For Tatyana, that plan means competing every day for a week straight. The marathon is her last event.

"I just have to tell myself to take each race at a time, each day at a time," she said. "I can't focus on everything. The human brain can only take so much, and that can just exhaust you."

Tatyana's schedule also means she'll be competing against her little sister in the 100-meter.

"I'm looking forward to it," Hannah said. "It's going to be a challenge, but it's going to be fun."

Deborah McFadden said she had spent much time figuring out how to cheer for both her daughters at once, but she came up with a solution. Instead of wearing a shirt that says "Go, Hannah, go," or "Go, Tatyana, go," she's wearing a shirt that says simply "Team McFadden."

"It's overwhelming," Deborah McFadden said. "Two of my children are representing the United States of America as elite athletes. ... Again, I get choked up."