More than one in ten Australian families with dependent children is a blended family. That number continues to grow — yet most standard wills are written as though everyone has one partner and children who share both parents. They don't account for the complexity of real life.
If you're in a blended family, the stakes of getting your estate planning wrong are particularly high. Without careful planning, you risk leaving your current partner financially exposed, inadvertently cutting out children from a previous relationship, or creating a family dispute that outlasts you by decades.
The Core Problem: Competing Loyalties
Estate planning for blended families isn't simply about who gets what. It's about balancing two sets of people who both have legitimate claims on your care and generosity — your current partner and your children from a previous relationship.
The tension is real. If you leave everything to your current spouse, your children from a first marriage may receive nothing — especially if your spouse later remarries or has children of their own. If you leave assets directly to your children, your current partner may be left without adequate financial support.
Standard wills struggle to resolve this tension. Structured estate planning can.
What Happens If You Die Without a Will
Dying intestate — without a valid will — is particularly damaging for blended families. Australian intestacy laws distribute your estate according to a rigid formula based on legal relationships, not the reality of your family.
Under most state and territory laws, step-children have no automatic right to inherit from a step-parent, regardless of how long you raised them or how close your relationship was. Only biological or legally adopted children are recognised under intestacy rules.
There's another trap that catches many blended families off guard: in most Australian states, marriage automatically revokes your existing will. If you remarried and didn't update your will, you may effectively have no valid will at all — even if you made one before the marriage.
The "Sideways Inheritance" Trap
One of the most common and painful outcomes for blended families is what estate lawyers call "sideways inheritance." Here's how it happens:
- You leave everything to your current spouse, intending them to look after your children.
- Your spouse later remarries or updates their own will.
- When your spouse dies, your assets pass to their new partner or their own children — not yours.
- Your children from a previous relationship receive nothing from your estate.
This outcome is more common than most people expect. And once it happens, there is very little your children can do to reverse it.
Key Strategies for Blended Families
1. Life Interest Arrangements
Rather than leaving the family home directly to your spouse, you can grant them a life interest — the right to live in the property for the rest of their life. When they die, the property passes to your children, not to anyone your spouse may have chosen.
This protects your spouse's housing security while ensuring your children ultimately receive what you intended for them.
2. Testamentary Trusts
A testamentary trust — a trust created through your will that comes into effect when you die — is one of the most powerful tools available to blended families. You can structure it to:
- Pay income to your spouse during their lifetime
- Preserve the capital for your children
- Set conditions on how and when distributions are made
- Protect assets from a future relationship your spouse may enter
Our estate planning team can advise on whether a testamentary trust structure is appropriate for your circumstances.
3. Mutual Wills
Mutual wills are a pair of wills made by two partners with a binding agreement that neither will be changed after the first death. They can protect against the sideways inheritance problem — though they require careful legal drafting and ongoing legal advice to enforce effectively.
4. Superannuation Nominations
Your superannuation does not form part of your estate and is not controlled by your will. The trustee of your super fund distributes it based on your death benefit nomination — or, without a valid nomination, at their own discretion.
In a blended family, this matters enormously. Without a binding nomination, your super could be paid entirely to your surviving spouse, bypassing your children from a previous relationship. With a binding nomination, you control exactly who receives it and in what proportions.
Review your superannuation nominations every time your family circumstances change.
Step-Children and Family Provision Claims
Step-children who were financially dependent on you may be eligible to make a family provision claim against your estate — even if they're not named in your will. The rules vary by state and territory, but courts in New South Wales, Victoria, and Queensland have recognised claims by adult step-children in appropriate circumstances.
The best way to minimise the risk of a claim is to address your step-children's situation explicitly in your estate plan — either by providing for them directly, or by documenting clearly why you chose not to.
Life Insurance as an Estate Planning Tool
Life insurance can be a practical solution for blended families, particularly where most of your wealth is tied up in the family home or a business. By taking out a policy and nominating your children as beneficiaries, you can provide for them directly — outside your estate, and therefore outside any dispute with your spouse's estate.
If you don't have life insurance in place, our life insurance page can help you compare options through our trusted partner.
Keep Your Documents Where They Can Be Found
Even the most carefully drafted estate plan is undermined if your family can't find the documents when they need them. In a blended family, where relationships can be strained and information may not flow freely between households, this risk is even higher.
Custodium Vault gives you a secure, encrypted place to store your will, trust deeds, superannuation nominations, insurance policies, and any letters of wishes — and ensures the right people know where to find them.
Where to Start
If you're in a blended family and haven't reviewed your estate plan recently — or at all — the most important thing you can do is get professional advice. Standard will-writing services are rarely equipped to handle the complexity of blended family structures.
Our estate planning team works with blended families across all Australian states and territories. We can help you design a structure that protects your partner, provides for your children, and minimises the risk of family conflict after you're gone.
This article is general information only and does not constitute legal advice. For advice specific to your situation, speak with a qualified Australian estate planning lawyer.