Imagine if you lived in the 19th Century and you communicated by letter, and your grandfather suffered a severe injury and couldn't and read or write you letter

Imagine if you lived in the 19th Century and you communicated by letter, and your grandfather suffered a severe injury and couldn't and read or write you letters anymore, and instead they were dictated via scribe who wasn't a fluent speaker of the language. That's what a degenerative brain disease is like.