My mother is 82 years old, has dementia and is progressing quite fast according to the doctor, was diagnosed having lung cancer a few weeks ago, and was given 3 to 6 months to live? The family members plan to tell her about her having cancer or a tumor. I have to concerns: 1 - How do we tell her?, 2 - Since she has dementia, can we respect her wishes during moments of being lucid? What if she changes her wishes after a day or too, what do we follow? She had dementia about 6 years ago, had pneumonia last 2007, had no x-rays conducted from 2008-2010. Had a seizure a few weeks ago, was hospitalized, took an xray and saw the tumor about 5 cm.