This is a must have!
If decisions are made...hard choices, etc....this gives the sibling, siblings the authority to do what is needed.
On the family end.....try to involve as many family members as possible to help bear the load that is about to come everyone's way. Appoint a leader and sort out who is willing to do what. There will be a lifetime of "stuff" to go through so choose wisely.
Many prayers!!!!