- Fred Trump Sr. (Father): Diagnosed with Alzheimer's in 1991, he experienced a long-term decline that lasted until his death at age 93. He experienced a nearly decade-long decline. To maintain the illusion of work, the Trump Organization created a "pretend office" for him where he would sign blank papers
- Other Relatives: Reports indicate that Donald Trump's sister, Maryanne Trump Barry, and his cousin, John Walter, also showed signs of dementia.
- Concerns Raised: Critics, some family members, and former aides have noted observed behaviors in Donald Trump—such as confusion, disorientation, and memory lapses—which they compare to the early symptoms of his father's illness.
- Mary Trump, a psychologist, has alleged that she has observed behaviors in Donald Trump, such as disorientation and confusion, similar to her grandfather's condition.
AI summary