"I just know that my brain's not right," said Carrie Richardson, 44. "And so, I hate it. I just want it to be normal."

At 41, Carrie developed early-onset Alzheimer's disease. The condition is caused by rare genetic mutations that essentially guarantee a person will develop the disease. Her mother, Mary Salter, of Montgomery, Alabama, knows the toll of the disease all too well. "I've lost seven family members from the ages of 37 to 44," she said … including her son, Bryan, who died last year.

Carrie Richardson, 44, inherited a genetic mutation that caused early-onset Alzheimer's disease. She's participating in an Alzheimer's research study at Washington University School of Medicine. CBS News

Mary, Carrie, and Carrie's daughter Hannah have been coming to the Washington University Sch

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