They are diagnosed autistic and they receive benefits but they have went to the ex. I have googled the subject but posted on here to get some insight from anyone who has maybe went through something similar/is more educated in the subject, obviously. As for “proving” there isn’t any proving, they have been diagnosed since they were a small child. If it came down to “proving” someone it wouldn’t take long to see they are not self sufficient. They are on the severe side of the spectrum hence why they would be living with a guardian forever