Double trouble: The Campbell sisters' road to Rio

Bronte posted this photo on her Instagram account in April saying,"Going to the Olympics together has been our dream since we were little." Photo: Instagram/Bronte_Campbell

Bronte and Cate Campbell celebrate winning gold and setting a new world record in the final of the Women's 4 x 100m Freestyle Relay on Day 1 of the Rio 2016 Olympic Games. Photo: Getty

Bronte and Cate react after failing to place in the women's 100m freestyle final. Photo: AAP

Simone Manuel (R) of the United States touches the wall to win gold in the women's 100m freestyle final, leaving Cate to finish in sixth place. Photo: Getty

The girls smile after taking out gold in the final of the women's 4 x 100m freestyle relay on Day 1 of the Rio 2016 Olympic Games. Photo: Getty

The Campbell girls prepared for Rio together. Photo: Instagram/Bronte_Campbell

First-place Bronte celebrates with third-placed Cate after the women's 100m freestyle final at the 16th FINA World Championships in Kazan, Russia in 2015. Photo: Getty

The girls pose together with their medals in Barcelona in 2013. Photo: Instagram/Cate_Campbell

Cate is congratulated by Bronte after winning the women's 50 metre freestyle at the 2016 Australian Swimming Championships in South Australia in April. Photo: Getty

The sisters pose during a portrait session on February 23, 2016 in Brisbane, Australia.