There was a JW who was a born in and faded about 10 years ago near a congregation I attended. He never married or had children and was in his late 30's. His parents shun him for the most part but then he had a major stroke. His parents are now his care providers, and they take him to meetings. He has had memory issues but is slowing making progress.
I also knew of a sister that was DF and was in a major car accident many years ago, and same thing happened to her. Her parents became guardian and got her reinstated and is now attending meetings. But she is not the same person and has a limited mental capacity.