You can sue a family member. Courts apply the same procedural rules, evidentiary standards, and burdens of proof whether the defendant is a stranger or your sibling, and the question of whether you can sue family members turns less on the relationship itself than on two other things: whether a specific immunity doctrine blocks the claim, and whether any judgment you win will actually be collectible.
What Family Members Typically Sue Each Other Over
Most lawsuits between relatives fall into three buckets: money owed, property disagreements, and personal injuries. None of these require a different legal theory because the parties are related. What changes is the evidence problem. Family dealings tend to happen on a handshake, and handshakes are hard to prove.
Unpaid Loans and Broken Promises
Informal loans between relatives are the single most common trigger for family lawsuits and among the hardest to win. A verbal loan agreement can be legally binding, but when the borrower says the money was a gift, the case collapses into competing stories. A signed promissory note, a text message confirming a repayment schedule, or bank records showing the transfer changes that calculation dramatically.
Some agreements have to be in writing to be enforced at all. Most states apply a statute of frauds covering real estate transfers, sales of goods worth $500 or more, and agreements that cannot be performed within one year. A verbal deal to buy a sibling’s share of the family cabin will not survive a court challenge without a signed document.
Co-Owned Property
Inherited real estate is a recurring source of family litigation. When siblings share a house and cannot agree whether to sell it, keep it, or rent it, any co-owner can file a partition action asking the court to divide the property or force its sale. Courts treat partition as a right available to any co-owner, so one relative can compel a sale over everyone else’s objection. The threat alone often ends the standoff.
Personal Injuries
If a relative negligently causes a car accident that injures you, you can file a claim just as you would against any other driver. In practice, these cases target the at-fault driver’s auto insurance policy, not their personal assets. The insurer pays medical bills, lost wages, and pain and suffering, and the family member behind the wheel rarely writes a personal check. The fact that you are related does not reduce your recovery.
Suing a Spouse
For most of American legal history, one spouse could not sue the other because the law treated a married couple as a single entity. That doctrine, interspousal immunity, has been abolished in nearly every state, with only a handful retaining any version of it. Spouses can now sue each other for negligence or intentional wrongs on the same terms as anyone else.
The practical catch is that most financial disputes between spouses belong in divorce court, not civil court. Divorce judges have broad authority to divide assets, assign debts, and set support in a single proceeding. Filing a separate civil suit over a marital financial dispute while a divorce is pending usually gets consolidated into the divorce or stayed.
A few situations do justify a standalone lawsuit. A tort that occurred before the marriage does not belong in divorce court. Disputes between spouses who co-own a business through an LLC or corporation are business litigation, handled in civil court. And claims involving financial exploitation of an elderly or vulnerable spouse, such as conversion or breach of fiduciary duty, can offer remedies that divorce proceedings do not, because they focus on recovering specific stolen assets rather than dividing marital property.
Can a Child Sue a Parent
Parental immunity is a doctrine that can block a minor child from suing a parent for negligence. The rationale is that courts should not second-guess routine parenting decisions or invite lawsuits that would disrupt family life. It applies only to unemancipated minors and generally covers ordinary negligence tied to supervision, discipline, and care.
The doctrine has significant exceptions in most states:
- Intentional harm. A parent who assaults or abuses a child cannot invoke parental immunity. The doctrine protects parental discretion, not violence.
- Motor vehicle accidents. Most states allow a child injured by a parent’s driving to bring a claim, because the real target is the auto insurance policy.
- Business activities. If a parent employs a child in a family business and the child is hurt because of unsafe conditions, the parent was acting as an employer. Courts treat these as workplace injury cases.
- Emancipated minors. Once a minor is emancipated, parental immunity no longer applies, and the minor can sue and be sued in their own name.
The scope of the doctrine varies widely. Some states have abolished it entirely, others keep it only for supervision-related negligence, and a few still apply it broadly. Whether it blocks your claim depends almost entirely on your state.
Contesting a Will or Trust
Estate fights are their own category of family lawsuit. The typical claim is that a will or trust does not reflect what the deceased actually wanted, either because someone manipulated them or because they lacked the mental capacity to understand what they were signing.
Undue influence is the most common theory. Courts look at whether the alleged influencer had a close relationship with the deceased, whether they helped prepare the document, whether the signing was kept secret, and whether the new will departed sharply from a prior estate plan. The physical and mental health of the person who made the will matters as well, because diminished capacity increases susceptibility to pressure from a dominant relative. The same analysis reaches lifetime gifts, and the legal standard for undoing a lifetime transfer is generally lower than for invalidating a will.
No-Contest Clauses
Some wills and trusts include a no-contest clause: challenge the document and lose, and you forfeit whatever you would have inherited. The clause only bites if you have something to lose. Someone disinherited entirely has no reason to fear it.
Enforceability varies by state. Many states will not enforce a no-contest clause if the challenger had probable cause to believe the document was invalid, which protects a beneficiary who raises a legitimate concern about fraud or undue influence even if the challenge fails. Other states enforce these clauses strictly regardless of the challenger’s good faith. Know your state’s rule before filing, because the downside is losing your entire inheritance.
Whether a Judgment Will Actually Pay
Insurance is the financial engine behind most family injury lawsuits, and policy language can quietly gut your case. Many homeowners policies contain a household exclusion that eliminates liability coverage for injuries to anyone living under the same roof as the policyholder. If your brother lives with you and trips on your broken porch step, your homeowners policy may refuse to pay. The exclusion typically covers any relative who is a member of the named insured’s household.
Auto policies sometimes contain similar intrafamily exclusions denying coverage when one family member injures another. Several states restrict or ban these exclusions, especially in wrongful death cases, but the rules vary. Reviewing the policy language before you file is essential. Winning a judgment that no insurance policy will pay is a hollow victory, and the same warning applies to spousal claims where a household exclusion can block coverage between spouses even though interspousal immunity is gone.
Filing Deadlines and When They Pause
Every lawsuit has a statute of limitations, and missing it ends the claim regardless of how strong the evidence is. Personal injury deadlines run two to four years in most states. Breach of contract runs longer, often four to six years, and written contracts sometimes get more time than oral ones.
Family situations create grounds for pausing the clock. The most important involves domestic violence: if the victim could not file within the normal window because of coercion, threats, or control by the person who harmed them, courts in many states will toll the deadline. The supporting theories include duress and equitable estoppel, which prevents an abuser from benefiting from a delay their own conduct caused. Some states also toll the clock when mental health consequences of the harm prevented the victim from acting.
Claims by minors get tolled almost universally. Most states pause the statute of limitations until the child reaches the age of majority, so a child injured by a parent’s negligence at ten may have until twenty or twenty-one to file. That tolling applies whether or not parental immunity would have blocked the claim during childhood.
Tax on What You Recover
Money from a lawsuit or settlement is sometimes taxable and sometimes not, and the family relationship does not change the analysis. What matters is the nature of the injury.
Damages for personal physical injuries or physical sickness are excluded from gross income under federal tax law, whether they come from a judgment or a settlement and whether they arrive as a lump sum or over time. Punitive damages are always taxable, even in a physical injury case.1Office of the Law Revision Counsel. 26 USC 104 – Compensation for Injuries or Sickness
Emotional distress is where taxpayers get tripped up. Compensation for emotional distress is tax-free only if it stems from a physical injury or physical sickness. If you sue a relative for defamation, harassment, or intentional infliction of emotional distress with no accompanying physical injury, the award is taxable. You can still exclude the portion of an emotional distress award that reimburses medical expenses you actually paid to treat the distress, as long as you did not deduct those expenses on a prior return.2Internal Revenue Service. Tax Implications of Settlements and Judgments The IRS does not care that the defendant was your brother.
Before You File
Litigation is expensive and slow, and lawsuits between relatives carry a second cost that lawsuits between strangers do not. Other family members take sides. Relationships fracture. That is not a reason to avoid filing when the claim is real, but it is a reason to look at cheaper and faster options first.
Try to Resolve It Directly
A written demand letter costs nothing and sometimes ends the dispute. Mediation, where a neutral third party helps both sides negotiate, is voluntary, confidential, and much cheaper than trial. Many family disputes over money, property, and estates are well-suited to mediation because both sides often want the relationship to survive. Some courts require mediation before letting a family dispute go to trial anyway, so starting there can save time.
Small Claims for Smaller Amounts
For modest disputes, small claims court is faster, cheaper, and less adversarial than a full civil suit. Dollar limits range from $2,500 to $25,000 depending on the state, with most capping claims between $5,000 and $12,500. You usually do not need a lawyer, filing fees are low, and cases are typically decided within a few weeks. For an unpaid family loan of a few thousand dollars, small claims court is often the right venue.
What Filing Actually Costs
Filing a civil complaint in state court runs roughly $75 to over $400 in initial fees depending on jurisdiction and case type. Federal court filings cost $405 as of late 2025. Attorney fees, discovery costs, and expert witnesses can push total litigation spending into the thousands or tens of thousands. If the amount at stake is small, the cost of chasing it through full-scale litigation may exceed anything you would recover.
Evidence is what wins these cases. Written contracts, text messages, bank statements, medical records, and witness testimony carry the day. If you are lending money to a relative or entering any significant arrangement now, creating a paper trail is the single most useful thing you can do to protect a future claim.