Which members of the Trump family have publicly reported memory or cognitive issues?

1. Niece Mary Trump: the most prominent family voice on cognition

Mary Trump, a clinical psychologist and frequent media critic of her uncle, has publicly stated she believes Donald Trump is showing short‑term memory deterioration and signs resembling the dementia she observed in their grandfather, Fred Trump Sr.; she made those claims in interviews and on The Daily Beast podcast in November 2025 ^{[1] [2]}. Media outlets quote her describing orientation and impulse‑control problems and saying she “sees” similarities between Donald and Fred Sr.’s decline ^{[1] [5]}. Those are public observations by a family member with clinical training, not a formal medical diagnosis ^[6].

2. Nephew Fred C. Trump III: “it runs in the family”

Fred C. Trump III has told reporters and written about the family’s history of dementia, saying he observed warning signs in Fred Sr. and that he sees parallels in Donald Trump’s behavior; he publicly called attention to this in a People interview (Nov. 2024) and in media appearances in 2025 ^{[3] [4]}. News pieces cite his remarks that anyone denying dementia in the family is mistaken and that he has “seen” a decline in his uncle ^{[3] [4]}.

3. The elder generation: Fred Trump Sr. — documented memory decline

Reporting cites a physician’s 1991 diagnosis of “mild senile dementia” for Fred Trump Sr., noting “obvious memory decline” and “significant memory impairment” leading up to his death in 1999; Mary Trump and others reference that diagnosis when warning about familial risk ^{[1] [7]}. Multiple outlets repeat that medical history as context for family concerns ^{[1] [8]}.

4. Other family members: public mentions, limited specifics

Some stories and interviews reference Maryanne and other relatives as having had cognitive problems in later life, largely via anecdote in family members’ accounts; these assertions are reported by relatives like Fred III and Mary but detailed medical records or formal diagnoses for those other family members are not presented in the reporting provided ^{[4] [3]}. Available sources do not mention formal diagnoses for those other relatives beyond Fred Sr. ^{[1] [3]}.

5. The subject of the concerns: Donald Trump — observations vs. official findings

Family members and several commentators have publicly described forgetfulness, rambling or tangential speech, and apparent memory lapses in Donald Trump; Mary Trump and Fred III use those observations to warn about dementia risk ^{[2] [3]}. Independent commentators and psychologists quoted in coverage interpret speech patterns and behavior as possible signs of cognitive decline, but the articles make clear that public observations are not the same as clinical diagnosis ^{[9] [10]}. The White House released a physical and cognitive‑screening result stating Trump was “fully fit” in an April 2025 examination, but family commentary continues to dispute and interpret public behavior differently ^{[11] [1]}.

6. How reporters and experts frame these claims

News coverage distinguishes three things: documented family history (Fred Sr.’s diagnosis) as reported in medical notes ^[1], family members’ professional‑and‑personal observations (Mary Trump’s clinical background and Fred III’s memoir and interviews) used to draw parallels ^{[1] [3]}, and external expert commentary noting that family history raises odds but that public behavior alone cannot substitute for clinical evaluation ^{[9] [10]}. Several outlets explicitly note the difference between observation and diagnosis ^{[6] [9]}.

7. Conflicting agendas and limitations in the public record

Family members who speak out about cognitive issues also have public disputes with Donald Trump and political agendas that critics point to; sources acknowledge Mary Trump’s longstanding estrangement and political critiques, and the Trump campaign has dismissed some accounts as politically motivated ^{[6] [12]}. Reporters rely on interviews and public appearances; the reporting does not include independent medical records for most living family members beyond the cited historical notes about Fred Sr. ^{[1] [3]}. Where sources lack documentation, state: not found in current reporting.

8. Bottom line for readers

Publicly, the Trump relatives who have raised memory or cognitive concerns are Mary Trump (niece) and Fred C. Trump III (nephew); they point to documented dementia in Fred Trump Sr. as a family precedent while interpreting Donald Trump’s public behavior as worrisome ^{[1] [3]}. Those are public statements and professional observations; available reporting does not provide independent, new medical diagnoses for Donald Trump or other living family members beyond what family members and commentators assert ^{[6] [9]}.