Each of four girls shares some disability, different personality
The Johnson girls are autistic, a disorder characterized by difficulty with social interaction and verbal and nonverbal communication. Over the years, they've displayed unusual or repetitive behaviors.
Though they share a disability, each has a distinct personality.
The twins
The bond between Rachael and Aletha transcends autism, say their parents.
When they were 3 years old, they found ingenious ways to break into their parents' locked bedroom. They'd leave a pile of toys underneath the door as evidence of their efforts to pop open one of the locks.