When siblings fall out: inheritance disputes and family rifts

Sibling fallouts are one of the most painful – and common – consequences of inheritance disputes.

Arguments that began in childhood resurface with full force. Grief magnifies old hurts.

And suddenly, families that once gathered around the same table won’t even speak to each other. As contentious probate lawyers, we see this all the time. And it rarely starts with money alone.

The Real Roots of the Rift

At the heart of many disputes are feelings – not figures.

“Mum always favoured you.”

“Dad never appreciated what I did.”

“You were never around when they were ill.”

“You don’t deserve more than me.”

Inheritance can act like a spotlight, shining a direct light on decades-old family dynamics. It becomes less about who gets what and more about what it means.

Common Sibling Disputes We See

Validity Challenges

A sibling is excluded from a Will – often replaced by one or more of their brothers or sisters.

This raises immediate questions of:

• Capacity: Did Mum really understand what she was signing?

• Undue influence: Was Dad pressured to change the Will?

• Lack of knowledge or approval: Did they even know what was in it?

The excluded sibling may feel devastated, confused and ready to challenge.

Executor Disputes

When a sibling is appointed executor, others may mistrust how the estate is being handled. Common complaints include -

• Lack of transparency

• Delays in administration

• Accusations of bias or self-interest

An executor sibling often feels burdened and defensive; the others feel shut out. The breakdown can become legal and deeply personal.

IPFDA Claims Between Siblings

Under the Inheritance (Provision for Family and Dependants) Act 1975, one sibling may bring a claim for ‘reasonable financial provision’ - often because -

• They were financially dependent on the deceased

• They received significantly less than others

• They were left out entirely

These claims often trigger a full examination of family history, need and fairness.

Can Parents Prevent Sibling Disputes?

Maybe. Maybe not. Thoughtful estate planning can make a big difference.

This includes -

• Talking openly about your wishes

• Leaving a clear and up-to-date Will

• Writing a letter of wishes explaining your decisions

• Appointing neutral executors where appropriate

• Considering the emotional weight of your decisions, not just the financial ones

What Happens When It’s Too Late?

If you’re already in the middle of a sibling dispute over inheritance, you’re not alone and it’s not always as simple as walking away.

Legal advice can help clarify -

• Whether you have a valid claim or defence

• What are your responsibilities as an executor or beneficiary

• How to de-escalate conflict wherever possible

Final Thought

When a parent dies, siblings should ideally support each other. But when emotion, grief and legacy collide, that’s not always the case.

If you’re facing a family fallout over a Will, an estate, or your role as executor, we can help you move forward – legally and practically.

Because resolving these disputes is about more than law, it’s about protecting what matters.

How Can Forbes Help You?

At Forbes, we know that inheritance disputes aren’t just legal problems; they’re deeply personal ones. Our Contentious Probate and Trusts team is highly experienced in helping clients navigate the emotional and legal challenges that arise when families fall out. Whether it’s concerns about testamentary capacity, undue influence, executor misconduct, or disputes under the Inheritance Act, we provide strategic, compassionate advice tailored to your unique situation. We aim to resolve conflicts with clarity, efficiency, and minimal stress, so you can move forward with confidence.