Dr. Barry J. Jacobs, noted clinical psychologist, family therapist, and author, talks about the grief Alzheimer’s caregivers often feel for the loss of a person who is still physically present, but no longer the person they once knew. He explains the concept of ambiguous loss, as pioneered by Dr. Pauline Boss, when the person with dementia is ever present to us but also mostly absent, and how to handle this excruciating ambiguity.