When a Sibling Contests the Will — During Caregiving

Published May 7, 2026 · 5 min read

You've been the one showing up. Doctor's appointments, medication management, midnight phone calls, cleaning the house, managing the bills. And then your sibling — the one who hasn't been around — finds out that Mom updated her will to leave you the house. Now they're talking about lawyers. About undue influence. About how you "manipulated" Mom while she was sick.

The will isn't even in effect yet. Your parent is still alive. And your family is already tearing itself apart over money.

Can a Will Be Contested While the Person Is Still Alive?

Technically, a will can't be contested until after death. A will has no legal effect while the person who wrote it is alive — it's just a set of instructions waiting to be activated. Probate doesn't happen until someone dies, and you can't challenge a will in probate court before probate begins.

But here's what actually happens: a sibling doesn't contest the will itself. They challenge the underlying legal authority. They might: Our guide on fighting over the family home covers this in detail.

• Claim the parent lacks capacity and therefore shouldn't have been able to change the will. This is especially common when a parent has dementia or cognitive decline.
• Allege undue influence — that the caregiver sibling pressured or manipulated the parent into changing the will. Courts look at factors like the relationship between the influencer and the vulnerable person, whether the person was isolated from other family, and whether the changes disproportionately benefit the person who had access.
• Seek a guardianship or conservatorship to take control of the parent's decision-making. If a court appoints a guardian, that guardian might have the authority to undo recent changes to estate documents.
• File a petition with Adult Protective Services alleging financial exploitation. APS can investigate, and if they find evidence of exploitation, it can trigger legal proceedings.

None of these are technically "contesting the will." But they accomplish similar goals — and they can happen while your parent is still alive.

Why This Happens (The Real Reasons)

The sibling who contests isn't always greedy. Sometimes they are. But usually there's something more complicated going on. Our guide on estate planning covers this in detail.

Guilt disguised as suspicion. The sibling who wasn't there knows they weren't there. That guilt is uncomfortable, and it's a lot easier to redirect it as "you manipulated Mom" than to sit with "I didn't show up." Accusing the caregiver of undue influence reframes their absence as your fault.

Loss of control. When one sibling is handling everything — the care, the finances, the legal documents — the other siblings can feel shut out. They don't know what's happening, they don't trust the process, and when they find out the will changed, it confirms their worst fears. Our guide on documenting everything covers this in detail.

Genuine concern. Sometimes the accusation has merit. Caregiving creates a power dynamic. The caregiver has access, proximity, and influence. Not every caregiver uses that responsibly. If your sibling has legitimate reasons to worry about your parent's autonomy, that concern deserves to be heard — even if it's expressed badly.

How to Protect Yourself as the Caregiver

If you're the sibling providing care and your parent has changed their estate documents in your favor, you're in a vulnerable position — regardless of whether you did anything wrong. Here's how to protect yourself:

• Make sure your parent had independent legal counsel. If your parent changed their will, they should have done it with their own attorney — not yours, not one you recommended. An independent attorney creates a record that the change was the parent's voluntary decision.
• Get a capacity evaluation. If there's any question about your parent's cognitive state, ask their doctor to document their capacity at the time of the legal change. A contemporaneous medical record of capacity is powerful evidence against a later claim of incapacity.
• Document everything. Keep records of your caregiving. Hours, tasks, expenses, medical appointments, conversations. If you're accused of undue influence, a clear record shows you were providing care — not running a scheme.
• Don't isolate your parent from other family members. One of the biggest red flags for undue influence is isolating the vulnerable person from their support network. Even if your siblings are difficult, keep the door open. Invite them to visit. Include them in updates. Make sure your parent has contact with people outside your household.
• Be transparent about finances. If you're managing your parent's money under a POA, keep meticulous records. Every transaction, every expense, every withdrawal. If someone challenges you, receipts are your best defense.

What to Do If You're the Concerned Sibling

If you're on the other side — worried that your sibling is influencing your parent — take a breath before reaching for a lawyer.

Start with a conversation. "I noticed Mom changed her will. I'd like to understand why. Can we talk about it?" If you can't talk to your sibling, talk to your parent directly. If your parent can explain the change coherently and it reflects their values, you might have your answer.

If you genuinely believe your parent is being exploited, consult an elder law attorney. They can advise you on whether there's grounds for a guardianship petition or an APS report. But know that these processes are adversarial, expensive, and painful. They should be a last resort, not a first move.

The will is a symptom. The disease is a family that doesn't have a system for communication, transparency, and shared decision-making. By the time you're fighting about the will, you've already lost something more important than the house. For a side-by-side look at tools that help families coordinate, check our caregiving app comparison guide.