Are you and an adult sibling at war?
If so does that sibling disconnect cause a doleful chorus of commentary among your family- do they want you to resolve the differences- http://www.npr.org/2010/11/25/131590706/siblings-find-support-and-friendship-in-each-other
Especially if you are moving towards an aging parent crisis http://www.youtube.com/watch?v=0NkQdNMZvSY
At every new developmental phase of the life cycle, the family is the main unit of service.
Within the family, the workhorse unit is the sibling dyad. Professionals in aging have an interest in siblings because they are the strongest alliances in the aging family.
In the mid-life family, the adult children call upon an aging professional to help with the care of a parent. Those adult children will usually be comprised of several siblings who they hold great power in the family.