Brooke Rosenberg is from England. She's a 11 5-year-old girl. She smiles a lot. She loves the color pink 12 she loves to dance. "If they have Olympic dancing, I want to 13 in that," she said.

Brooke also 14 her big sister, Caitlin, who is eight. Caitlin looks after her little 15 . They play together. They 16 to Greenwood Mill Elementary School together, too. "We like to ride 17 . We have nice pink bikes," Caitlin said.

But Brooke Rosenberg had cancer three years ago. Her sister will give 18 bone marrow (骨髓) tomorrow. "It feels really 19 to do that," Caitlin said about her bone marrow.

They'll 20 Super Sisters capes (斗篷) to take part in an event. They want to help more children with cancer.