Ptolemy was suffering from an early stage of dementia due to his ageing. It was very hard for him to remember family member names or even when he leaves one room and go into another, he would forget what he went in the next room for. He was confused and his mind would wonder all the time, it's all signs of dementia. Dementia is defined as "aphasia", problem with communication, "agnosia", problem with recognition and "disturbance in executive functioning" Phillips,Ajrouch & Hillcoat-Nalletamby, 2012 . They have chronic memory lost and at least one other cognitive function per David B. Reuben statement on the video. Ptolemy was 91 years old which has cause his ageing process. There are four types of ageing which are chronological, biological, psychological and social ageing. Although Ptolemy is an older adult he refused to move out of his apartment and was not going to allow anyone else to put him out.
Ptolemy needed much "care" to help him with food shopping, cashing his checks, house cleaning, protection for people on the outside, doctor appointments, cooking, managing his money, and much, much more. Per the book it states care "provides and receive assistance in a supportive matter" Phillips,Ajrouch & Hillcoat-Nalletamby, 2012.
Mr. Grey had Reggie to care for him and he was also his "advocacy" until Reggie was murdered then he had nobody for awhile until Robyn came into his life. Advocacy per the book states "is a process to help older people ensure that their rights and choices are exercised and to enhance self-determination" Phillips, Ajrouch & Hillcoat-Nalletamb. This is the role Reggie played in Mr. Gray life and much more then Robyn took on that role alone with other hats she wore to help in Mr. Gray life.
References
Mosley, W. (2010). The last days of Ptolemy Grey, Riverhead Books: New York, NY.
Phillips, J., Ajrouch, K., & Hillcoat-Nalletamby, S. (2012). Key Concepts in Social Gerontology. Sage Publications, Inc.: Thousand Oaks, Ca.