What is the longest somebody can live with a family member with dementia?

It depends: There is no set answer. You can live with a person with dementia until your health or the health and safety of the person with dementia are at risk. It is definitely a difficult decision to make.

Tolerance resources: It will depend on the rate of decline and the availability of help. Medications slow the rate of impairment and caregivers may be available through other agencies.