Snoop's daughter Cori diagnosed with lupus

Despite visiting countless doctors, no one was able to offer the rapper and his family a diagnosis for little Cori. "I felt helpless," Snoop told PEOPLE while fighting back tears. "No power, no friends."

Months later, after getting the heartbreaking diagnosis of lupus, Snoop Dogg and his family began their journey to understand the autoimmune disease, which ultimately brought his family closer together.

"She's the toughest little thing I've ever met," the rapper says of his daughter. "She's on the honor roll, playing volleyball and softball, living life. She has all this joy. In the beginning lupus was winning. But now Cori is."