New Zealand Law
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Your sister will be entitled to a claim to half of all of the relationship property. This will include any house, holiday home, Kiwi Saver or other superannuation, motor vehicles, household effects and other savings. Even if the title to the property is not in her name, the Property Relationships Act gives her this entitlement. She can arrange to place a notice on the title in the meantime, and if necessary bring a claim in the family court to divide the property. Even if he has excluded her from the will, she can still make a claim under the Property Relationships Act against his estate for her half share. People often say things like this when the separation takes place, but he will get advice from his own lawyer that she is entitled to a 1/2 share, and there is little which he can do about this
The only way to contract out of a property claim is to have a relationship property agreement where each party has independently taken advice from their own lawyer. Even if she signed something which he gave her, this would not be valid unless it was an independently prepared agreement where she had her own legal advice