Blended Family Estate Planning NZ: Protecting Your Partner and Your Children

Blended families are the hardest estate planning scenario in New Zealand. Every decision you make to protect your partner can unintentionally disinherit your children from a previous relationship — and every move to protect your children can leave your surviving partner without a home.

The Property (Relationships) Act 1976 (the PRA), the intestacy rules, and the mechanics of property ownership interact in ways that catch families off guard. Here's how it works and what you can do about it.

The Core Tension

When a parent in a blended family dies, two groups have legitimate claims on the estate:

1. The surviving partner — who may have contributed financially to the household, who needs somewhere to live, and who has independent rights under the PRA
2. The children from a previous relationship — who may have been promised specific assets, who have no automatic claim on relationship property that goes to the surviving partner, and who can challenge the will under the Family Protection Act 1955

Without deliberate planning, one group's interests overwhelm the other's. The default legal mechanisms almost always favour the surviving partner, leaving children from the first relationship with less than the deceased intended.

How Property Ownership Structure Changes Everything

The single most important variable is how the family home is owned.

Joint Tenancy

If you and your partner own the property as joint tenants, survivorship applies automatically on death. The property passes directly to the surviving partner — outside the will, outside the estate, beyond the reach of any bequest you made to your children.

This is the default ownership structure for couples buying property together in New Zealand. Many blended-family couples hold property this way without realising its inheritance implications.

Tenants in Common

As tenants in common, each partner owns a defined share (typically 50/50, but any split is possible). On death, each partner's share passes through their will or intestacy — not to the surviving co-owner.

This structure lets you leave your half of the property to your children while your partner retains their half. But it creates a different problem: your children now co-own the property with your surviving partner, potentially forcing a sale if the relationship between them is strained.

The Life Interest Solution

A common approach for blended families: own the property as tenants in common, and in your will, grant your surviving partner a "life interest" in your share. This gives them the right to live in the property for their lifetime (or until they choose to leave), after which your share passes to your children.

The life interest protects both groups — your partner keeps their home, and your children eventually receive your share. But the devil is in the detail:

• The surviving partner must maintain the property and pay their share of rates and insurance
• Your children can't sell or access the value of their inheritance until the life interest ends
• If your partner enters residential care, the life interest may need to be converted to a capital sum
• The surviving partner may need probate to register the life interest with LINZ

The PRA Election

When the first partner in a blended family dies, the surviving partner must make their election under section 61 of the PRA within six months of probate:

Option A — claim a 50/50 division of relationship property under the PRA. This generally revokes any gifts in the will and intestacy rights. The surviving partner receives half of all relationship property (the family home, joint savings, assets acquired during the relationship) regardless of what the will says.

Option B — don't claim a PRA division. Instead, inherit under the terms of the will or intestacy rules.

For blended families, this election is critical. If the will leaves the deceased's share of the home to their children via a life interest, the surviving partner could override that plan by choosing Option A — claiming their 50% PRA share outright instead of accepting the life interest.

The PRA election is a legal right that cannot be taken away by the will. The only way to manage it is through a contracting-out agreement (section 21 of the PRA) — essentially a prenuptial agreement that defines how relationship property will be divided on death. These must be signed by both partners, with each receiving independent legal advice.

Stepchildren and Intestacy

Under New Zealand intestacy rules, stepchildren have no automatic inheritance rights. If you die without a will:

• Your biological and legally adopted children inherit under the Administration Act 1969 formula
• Your stepchildren receive nothing, regardless of how long you've been their parent in practice

If you want your stepchildren to inherit, you must name them explicitly in your will. Even then, your biological children can challenge the will under the Family Protection Act 1955, arguing that adequate provision wasn't made for them.

Practical Steps for Blended Families

1. Get a will — this is non-negotiable for blended families. Intestacy produces the worst outcomes for everyone
2. Choose tenants in common for property ownership, with clear percentage splits that reflect financial contributions
3. Consider a life interest to balance your partner's housing needs against your children's inheritance
4. Get a contracting-out agreement (section 21 PRA) to manage the PRA election risk
5. Talk to your children — will challenges often arise from surprise and perceived unfairness, not from the actual distribution being unreasonable
6. Review your KiwiSaver — with no beneficiary nomination, your KiwiSaver balance is dealt with under section 65 of the Administration Act 1969, including the provider's small-balance release process. Make sure it's accounted for in your overall plan
7. Update your will after any relationship change — entering a new relationship, separating, or changes in your children's circumstances

The Cost of Not Planning

The default settings — joint tenancy, no will, no contracting-out agreement — funnel virtually everything to the surviving partner and virtually nothing to children from the previous relationship. For a blended family with a $800,000 house and $100,000 in KiwiSaver, the children from the first relationship could be entirely shut out.

Our New Zealand End-of-Life Planning Guide includes a blended-family planning framework that coordinates your property ownership, will, PRA strategy, and KiwiSaver into a coherent plan — making sure both your partner and your children are protected without one group's security coming at the other's expense.

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