"I've kind of just shrug off all the other expectations because, in the end, it's down to me. The rest of it doesn't matter."

Deep down, both sisters have surely had dreams of standing together on the Rio podium, arm in arm, each with a medal around her neck. But they have to keep it buried, to ensure they're both focused on what really matters.

They might be sisters, but they'll merely be two swimmers chasing the same thing when they take the starting block in Rio.

"It would be great," Cate said.

"But for me, it's about executing a good race, and hoping that Bronte does the same thing.

"I can't control what anyone else does in the field, especially what Bronte does. I have to focus on what I can do."