There is universal law on protecting the rights of people with mental incapability. The Mental Health Ordinance (Cap. 136) guarantees and protects the rights of people with mental illness throughout the course of illness and recovery, including those who have dementia. A guardian or a committee may be appointed for helping to take care of the property and affairs, as well as the medical and health care of individuals who are mentally incapacitated (Department of Justice, 2019b).

References:

Department of Justice. (2019b). Cap. 136 Mental Health Ordinance. Hong Kong Retrieved from https://www.elegislation.gov.hk/hk/cap136.