Will Disputes
When Estates Go To War: Famous Cases and the Law Behind Them
When someone challenges a will in court, they often expose a tangle of family conflict, high-value assets, and legal technicality. Whether the issue is undue influence, a lack of mental capacity, forgery or simple drafting error, these disputes can freeze estates for years — and occasionally decades — while the costs mount and relationships fracture.
The cases below are among the most striking examples of how badly things can go wrong. They are extreme by their nature, but the lessons behind them are universal: clarity, capacity and careful drafting matter enormously, and the absence of any one of them can undo a lifetime's intentions.
Five Cases That Show What Can Go Wrong
Anna Nicole Smith and the Billionaire's Estate
Perhaps the most famous modern inheritance battle began when 89-year-old oil tycoon J. Howard Marshall II married 26-year-old Anna Nicole Smith in 1994. Marshall died the following year, leaving almost his entire fortune — estimated at as much as $1.6 billion — to his son, and nothing to Smith. She claimed he had promised her a substantial share, and the dispute ran for some sixteen years, reaching the US Supreme Court twice. A Texas jury found the will valid and free from fraud or undue influence, and Smith's estate ultimately received nothing. The case is a stark reminder that even years of litigation cannot rewrite a will the court considers sound.
Leona Helmsley and the $12 Million Dog
When property billionaire Leona Helmsley died in 2007, her will left $12 million in trust to her Maltese dog, Trouble, while pointedly disinheriting two of her grandchildren. The bequest was challenged, and a judge later reduced the dog's trust to $2 million, finding that Helmsley had not been of sound mind when making the larger provision. The disinherited grandchildren were awarded several million between them. This is a vivid illustration of how capacity and rationality, not just intention, determine what a will can achieve.
Nina Wang and the Forged Will
Asia's wealthiest woman, Nina Wang, died in 2007, leaving an estate valued at billions. Shortly afterwards, her companion produced a will naming himself sole beneficiary. Wang's family foundation challenged it, and after a high-profile trial the court ruled the document a forgery. He was later imprisoned for the attempt. Forgery is among the gravest grounds for challenge — and among the hardest to conceal under forensic scrutiny.
J. Seward Johnson and the Contested Marriage
The 1983 death of Johnson & Johnson heir J. Seward Johnson triggered one of the most expensive estate battles in US history. He had left the bulk of a roughly $400 million estate to his much younger third wife, prompting his children from earlier marriages to contest the will on grounds of undue influence and lack of capacity. After a gruelling case, an out-of-court settlement was reached. Proof that contested wills rarely produce clean winners — only smaller estates.
Sir Peter Ustinov and the Pencil Will
The actor Sir Peter Ustinov died in 2004 having written a will in pencil decades earlier. Because he had remarried in the meantime, the document was ruled invalid, and he was treated as having died without a will at all. The resulting multinational litigation consumed much of the estate in legal fees, leaving his son close to financial ruin. A cautionary tale that an out-of-date or improperly executed will can be worse than none.
On What Grounds Can a Will Actually Be Challenged?
Contesting a will - known as contentious probate - requires proving specific legal grounds to have the document set aside or varied. The main grounds are:
Undue Influence
This is coercion: where someone is pressured into making or changing a will so it no longer reflects their true wishes. The legal bar is high — it isn't enough to show persuasion or advice; the testator's free will must have been overpowered. Courts look for red flags such as sudden changes shortly before death, isolation of the testator by a beneficiary, or a beneficiary closely involved in arranging the will. Because it usually happens privately, cases often turn on circumstantial evidence: medical records, witness statements and patterns of suspicious communication.
Lack of Testamentary Capacity
This claims the person lacked the mental ability to understand what they were doing. The long-standing Banks v Goodfellow test requires that they understood they were making a will and its effects, grasped the general extent of their property, appreciated who they might be expected to provide for, and were not affected by any disorder of the mind distorting their judgement. Importantly, a diagnosis of dementia does not automatically remove capacity — a person need only be of sound mind during a lucid interval at the moment of signing.
Lack of Valid Execution
A will must be in writing, signed by the testator and witnessed by at least two independent people present at the same time. Ustinov's case shows how fatal a failure here can be.
Fraud or Forgery
This covers faked signatures and fabricated documents, as well as "fraudulent calumny" — where a beneficiary lies to the testator about a relative to have them cut out.
Lack of Knowledge and Approval
Even a capable, un-coerced testator may not have truly understood the contents — a particular risk where someone was vulnerable, or the will was unusually complex.
Inheritance Act Claims
Even a valid will can be challenged as unfair: under the Inheritance (Provision for Family and Dependants) Act 1975, certain people — spouses, children and financial dependants — can claim it fails to make reasonable provision for them.
The Real Lesson Behind the Headlines
These cases are dramatic, but the principles they illustrate apply to every family. The vast majority of will disputes are avoidable. They arise not from malice but from wills that are out of date, poorly drafted, improperly executed, or made without clear evidence of capacity and intention.
A professionally prepared will — properly witnessed, regularly reviewed, and supported by sound advice — is the single most effective protection against your wishes being challenged or undone.