Have not personally been thru , what you are enduring. I have neighbors and acquaintances who are also struggling with the dilemma.
Their young children are in high school, some in college, and it is in some cases the older child that will need perhaps a home with adults their own age.
Since, we know siblings promise to care for a disabled sibling, lives change, job changes, divorces, marriages, and children with marriages, and at times it
is difficult to fulfil a promise made by a sibling to care for said disabled adult.
May, I say, I cannot advise, recommend , just pointed out what some in our circle are dealing with.