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By Michael Esparza, Digital Reporter (MEsparza@nexstar.tv)

LITTLE ROCK, Ark. - Huntington's Disease is a rare and fatal genetic condition which slowly breaks down nerve cells in the brain. 

It typically starts in a person's thirties or forties. 

"It's a brutal one," says DeClerk. "It's like having ALS, Parkinson's disease and Alzheimer's all in one," says DeClerk." 

With no cure, no signs or early symptoms it can leave families feeling confused. 

Abigail DeClerk spent years watching her sister, Lisa DeClerk, suffer from the diseases but never really knew what it was. 

"It took being you know this upbeat little girl to all of a sudden just like the blink of an eye - what happened," explains DeClerk.  

DeClerk now shares her sister's story to help other families find the support and help that they need. 

"People need to know about this," says DeClerk. "We can't stay silent in order to understand and by understanding that will give us hope." 

Many families are left with no answers because people affected typically don't die from the disease.