June and Jennifer Gibbons were twin sisters who were born in Wales in 1963. They were identical (which means they looked exactly the same) and they were very close. When they were young, they didn't talk to anyone outside of their family. This made some people think that they might have a developmental disorder called autism, but they were never diagnosed with that.
As they got older, June and Jennifer started communicating with each other in their own secret language. They also started writing stories and making up imaginary worlds together. They were very close, but they had a hard time making friends with other people.
When they were teenagers, June and Jennifer started getting in trouble. They would skip school, steal things, and get into fights. They were sent to a special school for children with behavioral problems, but they didn't do well there either.
Eventually, their parents decided to move the family to a different part of Wales. That's when things got even stranger.
June and Jennifer stopped talking to everyone except each other. They made a pact that only one of them could speak at a time, so they sounded like they were talking to themselves. They also started committing crimes together, like setting fires and stealing. They were arrested several times, but they never spent much time in jail because they seemed very disturbed and no one knew how to help them.
By the time they were in their early 20s, June and Jennifer were sent to a psychiatric hospital. They were diagnosed with schizophrenia, which is a mental illness that can make people have trouble telling what's real and what's not. They refused to talk to any doctors or nurses, so they were put in separate rooms and given medication. But they didn't get better.
In 1993, Jennifer died suddenly in her room. No one knows exactly how she died, but it's thought that she might have had an epileptic fit. After that, June stopped talking altogether. She was never diagnosed with a mental illness, but she was moved to a different hospital. She lived there for several more years until she died of a heart attack in 1996.
June and Jennifer's story is very sad and very mysterious. No one knows for sure why they acted the way they did, but some people think that they were trying to protect each other from a world that they didn't understand.