Most people think of estate planning as a paperwork problem: get a will drafted, sign it, file it away. The […]
Most people think of estate planning as a paperwork problem: get a will drafted, sign it, file it away. The harder truth is that an estate plan is really a set of instructions handed to grieving people at the worst possible time, and instructions that are vague, outdated, or incomplete are exactly what turns grief into litigation. Family estate disputes are common enough that they’ve become a subject of their own research. A 2023 survey by LegalShield found that 90% of Americans consider having a will important, yet less than half actually have one, and 58% of respondents reported having experienced a family dispute or had assets tied up in court due to inadequate estate planning. This article walks through the mistakes that show up most often in disputed estates, and why each one tends to produce the exact outcome it was supposed to prevent.
Mistake 1: Having No Plan, or an Outdated One
The most common starting point for a family dispute is simply the absence of a plan. When someone dies without a valid will, state intestacy law determines who inherits, and that default distribution frequently does not match what the person actually wanted. It may exclude a long-term partner who was never legally married to the decedent, split assets evenly among children when the decedent intended something different, or leave nothing to a stepchild who was raised as family but has no legal claim under intestacy rules.
An outdated plan causes a related but distinct problem. A will drafted decades ago, before a divorce, a remarriage, a new child, or a falling-out with a named beneficiary, can end up directing assets to people the decedent no longer intended to benefit, or omitting people who should have been included. Family members are often the ones who discover this mismatch, usually after it’s too late to ask the one person who could explain it.
Mistake 2: Ambiguous or Contradictory Language
Even a properly executed will can generate a dispute if its language is unclear. A will that refers to “my property in Bend” without a legal description, or that says assets should be split “equally” without specifying whether that means equal value or equal division of specific items, leaves room for more than one honest interpretation. When two heirs read the same clause and reach two different, equally plausible conclusions, the disagreement is not really about greed. It’s about the document failing to do the one job it had.
This is also where DIY estate planning tools tend to create the most risk. Generic templates are written to cover common situations in general terms, which means they often lack the specificity a particular family’s assets and relationships actually require.
Mistake 3: Choosing the Wrong Executor or Trustee
An executor or trustee has to manage significant responsibility, often while grieving alongside the rest of the family: paying debts, filing tax returns, distributing property, and communicating with beneficiaries who may not agree with every decision. Naming someone based purely on birth order or a desire not to hurt anyone’s feelings, rather than on their actual capacity to handle financial and administrative responsibility under pressure, is a common source of downstream conflict. When an executor is disorganized, plays favorites, or simply cannot communicate clearly with co-beneficiaries, disputes tend to follow even when the underlying estate plan was otherwise sound.
Mistake 4: Unequal Distributions Without Explanation
Unequal inheritances are not inherently a problem. A parent may have good reasons to leave more to a child who provided years of caregiving, or less to a child who already received significant financial support during the parent’s lifetime. The dispute usually doesn’t come from the inequality itself. It comes from the silence around it. When an heir discovers an unequal distribution with no context, the natural assumption is often that something went wrong: manipulation, mistake, or being deliberately cut out. A short letter of explanation, kept alongside the estate planning documents, can prevent years of resentment and, in some cases, outright litigation.
Mistake 5: Beneficiary Designations That Don’t Match the Will
Retirement accounts, life insurance policies, and many bank accounts pass to whoever is named as beneficiary on the account itself, regardless of what the will says. This is one of the most frequently misunderstood aspects of estate planning. Someone can execute a carefully drafted will leaving everything equally to three children, while an old 401(k) beneficiary form still names only one of them, from a job the decedent left twenty years earlier. The will’s instructions do not override the account-level designation. Families are often blindsided by this after the fact, and it is a frequent source of both confusion and formal disputes.
When Disagreement Becomes a Will Contest
Most estate disputes get resolved through negotiation among family members, sometimes with an attorney’s help. Some escalate into a formal will contest, which is a legal proceeding challenging the validity of the will itself, rather than simply disagreeing with how it distributes assets. According to Cornell Law School’s Legal Information Institute, the recognized grounds for a will contest typically include lack of testamentary capacity, undue influence, duress, improper execution, mistake, revocation, or fraud.
Two of these grounds come up more often than the rest. Lack of testamentary capacity refers to whether the person making the will understood what they owned, who their natural heirs were, and what signing the document would actually do. Undue influence refers to a situation where someone in a position of trust or control pressured the testator into a will that reflects that person’s wishes rather than the testator’s own. Both grounds tend to surface in cases involving elderly testators, late-in-life changes to an estate plan, or a caregiver or new relationship that suddenly plays an outsized role in how assets are divided. Neither is easy to prove, and both usually require significant evidence, which is part of why will contests are expensive, slow, and hard on every family member involved, win or lose.
What Tends to Prevent This
None of these mistakes are exotic. They’re ordinary oversights: a plan that was never updated, a sentence that could be read two ways, an account form nobody thought to revisit. What tends to catch them isn’t luck, it’s a planning process built specifically to look for mismatches like these before they become someone else’s problem to untangle. Firms that focus specifically on probate and estate planning, such as www.twosprucelaw.com, a Bend, Oregon-based practice built around that specialization, are generally positioned to look for exactly this kind of gap between a will’s language, its supporting documents, and the accounts that sit outside it, since spotting that mismatch is a routine part of the drafting and review process rather than an afterthought.
The Bottom Line
An estate plan’s job is to remove ambiguity at the exact moment ambiguity is most dangerous: after the person who could resolve it is no longer there to answer questions. Every mistake covered here, no plan, an outdated plan, vague language, a poorly matched executor, an unexplained inequity, or a mismatched beneficiary form, has the same effect. It leaves a gap, and grieving families tend to fill gaps with their worst assumptions about each other. Reviewing an estate plan periodically, and specifically checking it against life changes and outside accounts rather than treating it as a one-time task, is what actually closes that gap.
