Dad has moderate dementia, OCC. So Mom is in charge. Both are almost 90. Mom refuses to sign the papers to allow one or more of the adult children to make medical decisions for her or Dad in case she is unable to do so. She thinks we would just then have the power to not consider their wisher and just "kill" her or him.Both have also had falls at home. Thankfully no serious injuries. But perhpas Mom and Dad should have a Medical Alert system in case of other future emergencies. Dad has always been in charge of everythng, Mom is leery of making decision. How do we approach her gently on these ideas?