Is it possible to legally disown a sibling in the United Kingdom?

The simplest way is to write a will that bequeaths anything you may leave to one or more beneficiaries who are NOT your sibling. The sibling -- unlike a spouse or child -- would not have standing to challenge such a distribution.

I don't know what it would even mean to disown a sibling in law. "Disowning" is not a legal concept. Siblings have no special legal rights unless they have become your next-of-kin.

There seems to be no way that you can prevent them from being designated next-of-kin, but you can remove the legal rights that could come with that status. For example you could make a will to ensure they don't inherit, or if they are a danger to you, you could get a court order requiring them to keep away. The info below relates to the US, but UK and US legal systems are pretty similar.

avvo.com/legal-answers/how-to-remove-a-s....

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