Do Siblings Inherit on Intestacy UK (2026)? Whole Blood, Half Blood, and Per Stirpes Explained

Siblings are a relatively low priority under the intestacy rules (Administration of Estates Act 1925 s.46). They only inherit if the deceased died without all of the following relatives: (1) NO SURVIVING SPOUSE OR CIVIL PARTNER: if the deceased was married or in a registered civil partnership at the date of death, the surviving spouse or civil partner takes priority at the top of the hierarchy. The spouse receives the statutory legacy (£322,000 as of 2024) and a share of the residue — or the entire estate if small enough. Siblings get nothing; (2) NO CHILDREN, GRANDCHILDREN, OR FURTHER ISSUE: if the deceased left any children, grandchildren, great-grandchildren, or other lineal descendants, those issue inherit instead of siblings. The issue of a predeceased child take per stirpes in the child's place. Siblings are entirely excluded; (3) NO SURVIVING PARENT: if the deceased's father or mother (or both parents) survived them, the parents inherit the entire residue equally. Siblings are again excluded; (4) IF AND ONLY IF NONE OF THE ABOVE: where the deceased died without a surviving spouse/CP, without surviving issue, and without a surviving parent, the estate passes to siblings of the whole blood — equally, per stirpes if any predeceased; (5) PARTIAL INTESTACY APPLIES THE SAME RULES: where a will disposes of some but not all assets (partial intestacy — e.g. no residue clause), the intestacy rules apply to the undisposed portion. The same hierarchy applies: siblings only take if no spouse, issue, or parent has a claim on that residue; (6) THE HEADLINE MESSAGE: siblings inherit on intestacy only in relatively rare circumstances — where the deceased was unmarried, had no children, and their parents had already died. Many people assume siblings would inherit alongside a spouse, or in preference to distant relatives, when actually siblings may receive nothing.

English intestacy law distinguishes between siblings based on the number of parents shared with the deceased — and whole blood siblings take absolute priority over half blood: (1) WHOLE BLOOD SIBLINGS (AEA 1925 s.46(1)(iv)): a whole blood sibling (sometimes called a 'full sibling') shares BOTH parents with the deceased. For example, a brother or sister born of the same mother and father. Whole blood siblings inherit first in the sibling category; (2) HALF BLOOD SIBLINGS (AEA 1925 s.46(1)(v)): a half blood sibling (sometimes called a 'half brother' or 'half sister') shares only ONE parent with the deceased — typically where the parents had children with different partners. Half blood siblings only inherit if there are NO whole blood siblings, and no issue of deceased whole blood siblings; (3) THE PRIORITY RULE IN PRACTICE: (a) if the deceased has any whole blood siblings alive (or children of whole blood siblings who predeceased), the half blood siblings receive NOTHING; (b) half blood siblings only come into their own if the deceased's whole blood line is completely extinct; (4) PRACTICAL EXAMPLE: The deceased (Alice) had three siblings: Bob (same mother and father — whole blood), Carol (same mother only — half blood from father's second marriage), and David (same mother and father — whole blood). Bob and David are alive. Carol receives nothing — Bob and David share equally. If Alice had four whole blood siblings but three predeceased leaving children, and one is alive, the three sets of children take their parents' shares per stirpes — Carol (half blood) still receives nothing; (5) STEP-SIBLINGS: a step-sibling has no blood relationship to the deceased — they are related only by marriage (one parent married the other's parent). Step-siblings do NOT inherit on intestacy. They are invisible to the intestacy rules; (6) ADOPTED SIBLINGS: a person adopted by the same adoptive parents as the deceased is treated as a full sibling for intestacy purposes (Adoption and Children Act 2002).

When a sibling predeceased the intestate but left children of their own, those children do not lose out entirely — they 'step into the shoes' of their parent and take their parent's share per stirpes: (1) THE PER STIRPES RULE (AEA 1925 s.46(1)(iv)): where a whole blood sibling would have inherited but predeceased the intestate, leaving issue (children, grandchildren, etc.) who survive the intestate, those issue take their parent's share. The share is divided equally among the issue at the next generation — and so on for each generation; (2) WORKED EXAMPLE — ONE PREDECEASED SIBLING: The intestate died leaving three whole blood siblings: Amir (alive), Bella (predeceased, leaving 2 children: X and Y), and Carlos (alive). Estate = £300,000. Division: three equal shares of £100,000 each. Amir takes his £100,000. Carlos takes his £100,000. Bella's £100,000 goes to her children X and Y equally — £50,000 each. Total: £300,000. Note: Bella's children inherit Bella's share, not in their own right on the same level as the original siblings; (3) MULTIPLE PREDECEASED SIBLINGS: if Bella and Carlos both predeceased, Bella leaving 2 children and Carlos leaving 1 child — the estate is still divided into three equal thirds. Bella's third goes to her two children (split equally); Carlos's third goes to his one child; Amir takes his third directly; (4) WHAT IF A SIBLING'S CHILD ALSO PREDECEASED? If Bella's child X also predeceased but left grandchildren of Bella, X's share passes per stirpes again — divided equally among X's children (Bella's grandchildren); (5) HALF BLOOD SIBLINGS AND THEIR ISSUE: the same per stirpes rule applies to the children of predeceased half blood siblings — but only if there are no whole blood siblings or their issue surviving; (6) NO ISSUE OF A PREDECEASED SIBLING: if Bella predeceased leaving NO children, Bella's share does not go back into the pot equally — it is NOT redistributed to the surviving siblings. Instead, Bella's prospective share is redistributed among the remaining eligible takers (in this case, Amir and Carlos share the estate equally since Bella has no issue to take her share).

Where an estate passes to siblings on intestacy, the inheritance tax position is generally less favourable than where it passes to a surviving spouse: (1) NO SPOUSE EXEMPTION: the unlimited spouse/civil partner exemption (IHTA 1984 s.18) is not available where assets pass to siblings. Every pound above the nil-rate band (£325,000 in 2026) is subject to IHT at 40%; (2) NO RNRB: the residence nil-rate band (IHTA ss.8G-8K — up to £175,000 extra) is only available where the qualifying residential interest passes to a 'direct descendant' — child, grandchild, stepchild, adopted child, etc. A sibling is NOT a direct descendant. If the estate includes the family home and it passes to siblings on intestacy, the RNRB is completely lost; (3) EXAMPLE — IHT COST OF INTESTACY: the deceased died owning a house worth £500,000 and savings of £150,000 (estate = £650,000). No spouse. No children. No parents. Siblings inherit on intestacy. IHT: NRB = £325,000. No RNRB (not passing to direct descendant). Taxable estate = £325,000. IHT = £130,000 (40%). If instead a will had left the house to a child (even a niece or nephew cannot use RNRB — only direct descendants count) and savings to siblings, the RNRB would still be lost because nieces/nephews are not direct descendants; (4) THE CHARITABLE LEGACY OPTION: a will leaving at least 10% of the net estate to charity triggers a reduced IHT rate of 36% (IHTA s.24A — the 10% charity relief). This cannot be achieved on intestacy; (5) DEED OF VARIATION AS PARTIAL REMEDY: within 2 years of death, the beneficiaries who inherit on intestacy (the siblings) can execute a deed of variation redirecting assets to whoever they choose — including to charity for the 36% rate, or to the deceased's children from previous relationships. The variation is treated as made by the deceased for IHT purposes (IHTA s.142); (6) THE SIMPLE SOLUTION: a will entirely avoids these problems. Even a basic will directing the estate to siblings (if that is the intention) costs nothing extra in IHT compared to intestacy — but it provides the testator's certainty of outcome and avoids the rigid intestacy hierarchy.

If the deceased died intestate with no surviving spouse, no issue, no parents, no siblings of either blood — or siblings whose entire lines have also died out — the estate continues down the statutory hierarchy: (1) THE FULL ORDER OF PRIORITY (AEA 1925 s.46): (a) Surviving spouse or civil partner; (b) Children (and their issue per stirpes); (c) Parents; (d) Whole blood siblings (and their issue per stirpes); (e) Half blood siblings (and their issue per stirpes); (f) Grandparents (equally); (g) Whole blood aunts and uncles (and their issue per stirpes — i.e. cousins); (h) Half blood aunts and uncles (and their issue per stirpes); (i) BONA VACANTIA; (2) GRANDPARENTS (AEA s.46(1)(vi)): if no sibling or sibling's issue survives, the estate passes to the deceased's surviving grandparents equally. If only one grandparent survives, they take all; (3) AUNTS AND UNCLES (AEA s.46(1)(vii)): whole blood aunts and uncles of the deceased (the deceased's parents' full siblings). Their children (the deceased's cousins) take per stirpes if any aunt/uncle predeceased; (4) HALF BLOOD AUNTS AND UNCLES (AEA s.46(1)(viii)): same rule but half blood only if no whole blood aunts/uncles survive; (5) BONA VACANTIA: if none of the above categories survive, the estate passes to the Crown as bona vacantia. The Treasury Solicitor (or the Duchy of Lancaster/Duchy of Cornwall in relevant areas) takes the estate. The Crown has a practice of making ex-gratia payments to dependants or to causes the deceased would have supported — but there is no legal obligation; (6) THE MORAL OF THE HIERARCHY: the intestacy rules produce a mechanical result that may bear no relation to the deceased's actual wishes. A sibling who was estranged may inherit in preference to a beloved cohabiting partner of 30 years. The only way to ensure assets go to the right people is to make a will.