Why Is Cancer Survivorship Especially Difficult for Family Members in the "Sandwich

Why is cancer survivorship especially difficult for family members in the "sandwich generation"?

A) They are totally dependent on their parents who have cancer but are still the providers, and hence, "make the sandwiches."
B) They are the primary caregivers of children with cancer, and hence, "make their sandwiches."
C) They are cancer survivors who are in between ("sandwiched") treatments and require a great deal of support.
D) They are caught in the middle of caring for their own immediate family, as well as a parent with cancer.