Leigh, 16, and Lauren, 11, Massachusetts More about siblings >

Have you ever thought about how your diabetes affects your brother or sister? Or what it's like when more than one of you has it? These kids tell all.

Sister Act

Leigh remembers the day her younger sister, Lauren, was diagnosed with diabetes. "I wondered, What is diabetes? Would she be okay? Was Lauren dying?"

Now, five and a half years later, diabetes still creates friction between the sisters, but also brings them together. "Every year, (Leigh) helps our walk team raise thousands of dollars," Lauren says. "She gets all her friends and even her whole dance team to walk for me, and on that day I know she really wants me cured."

Brothers in Arms

Four-year-old Alex felt scared and alone when he was diagnosed with diabetes. Three years later, his older brother Eric was diagnosed, and Alex suddenly felt needed—and no longer alone.

"He asked me little questions, but to me it felt like I was the one he looked up to and that I was the one to come to when he was curious about something," Alex says.