If, as in my family, you have a brother or sister who needs information to support a disabled adult, particularly for the future, you may find the series of guides produced by the charity SIBS very helpful.
That was a really useful link, thanks J! I have often considered “sibling” activities and information in the past, but this guide is particularly good at laying out, in a very straightforward way, the nuts and bolts of looking OUT for (as opposed to looking after) a disabled brother or sister once the time comes that the parents are no longer in a position to take this role. Thank you for the link. 
So glad that you found it useful, Esther! Thanks for feeding back.