If a terminal Illness isn't a family crisis, I don't know what is.
I can't imagine anything worse than watching your own child die.
BOP: Inmate Temporary Release From Custody
Under special, limited circumstances, inmates who meet strict requirements may be allowed temporary releases from the institution through furloughs and staff-escorted trips. A furlough allows inmates to be in the community without a staff escort.
There are several purposes for furloughs: for example these enable inmates to be present during a family crisis, facilitate re-establishing family and community ties, and allow an inmate to participate in certain activities to help his/her release transition. The Bureau may authorize staff-escorted trips for purposes such as visiting a critically-ill family member; attending a funeral; receiving medical treatment; or participating in educational, religious, or work-related functions.