I have been going over this matter quite seriously, as I usually do when I visit my brother.
It all happened many years ago. He was only 21. A horse was involved, but that does not in any way change the problem that was caused. A rush of over a 300 Km by ambulance, (no air ambulance in those days), and four hours of surgery at the Royal Melbourne Hospital, saved his life. However, brain surgery was still quite rudimentary and there wasn't any rehabilitation.
My brother, in his retirement years, now lives in a Care Hostel where he tends a garden and several times a week goes out with friends from previous years. I have just spent a week with my brother and have again gone through all the difficulties that he lives with.
During the operation, part of his brain was actually removed, having been judged too badly damaged to recover. Of course everything that he had learned and which was stored in that part of the brain, has gone too. It so happens, I am told, that that part of the brain stores and organizes communication, and consequently my brother has severely diminished ability to communicate. His vocabulary is also very limited. He substitutes words that still remain for the ones that he can't retrieve. Thus he speaks about a "sheet" of cheese and similar swaps. It is very difficult to know what he wants because his default is "OK", and you cannot be sure whether he is doing it to please you or whether he really wants that.
I can sit there at times for 30 or 40 minutes, slowly and with repetition and illustrations, try to get a concept through to him. Then, when he actually speaks about it back to me, (with or without the correct vocabulary) I know he has got it. So I began to tell him about the cruise I had been on and showed him photos of the ship and some of the things we saw. Then taking the current catalogue, I showed him the cruise that was going from Sydney to Tasmania next November. I suggested that the two of us go on that cruise and he was really excited about that. Further explanation of how much we would have to pay, etc. and how we would get to Sydney from where he lives; and then he had the whole picture.
As I left him to come back home he told me that he would diligently save to be able to pay all of the cruise. I know I got through and I look forward to giving him a new experience later this year.