Definition
Inheritable blood is a historical common-law concept describing blood that carries the legal quality necessary to transmit or receive an inheritance through the rules of descent. A person was said to possess inheritable blood when two conditions were met: (1) the blood was free from corruption by attainder, and (2) the person was legitimate — that is, born within lawful wedlock or otherwise recognized as a lawful heir under the applicable rules of descent.
The concept operated as a gating mechanism in the common law of inheritance. Before any heir could take through intestate succession, the chain of descent had to pass through persons possessing inheritable blood at every link. If any person in the chain lacked inheritable blood — because of attainder or illegitimacy — the line of descent was broken, and those claiming through that person were cut off entirely.
Common Confusion
Inheritable blood is not simply a synonym for blood relationship or consanguinity. A person could be a blood relative in the biological sense and still lack inheritable blood in the legal sense. Illegitimate children, for example, were consanguine with their fathers but, under classical common law, could not inherit through the paternal line because the blood was deemed legally non-inheritable. The confusion between biological relationship and legal inheritance capacity is the central trap when reading historical sources on this term.
Inheritable blood should also be distinguished from the abolished doctrine of corruption of blood, though the two are closely related. Corruption of blood was the mechanism — the consequence of attainder — that destroyed inheritable quality. Inheritable blood describes the positive condition; corruption of blood describes its destruction.
Why It Matters in Research
This term is essentially extinct in modern American law, but it is indispensable for reading historical sources on descent, intestate succession, and the law of real property from the colonial period through the mid-nineteenth century. Several research traps are worth flagging.
First, attainder. The historical dictionaries tie inheritable blood partly to freedom from attainder. In England, attainder for treason or felony corrupted the blood of the attainted person and of that person's descendants, severing the line of inheritance above and below. In the United States, the Constitution prohibits bills of attainder and expressly forbids corruption of blood as a consequence of treason. American sources from the founding era forward eliminate the attainder component entirely, leaving legitimacy as the operative concern. Researchers reading English treatises — particularly Blackstone's Commentaries, Book II — must mentally subtract the attainder dimension when applying those sources to American questions.
Second, illegitimacy reform. The legitimacy component of inheritable blood was eroded progressively across American jurisdictions during the twentieth century. Constitutional decisions beginning with Levy v. Louisiana (1968) and Trimble v. Gordon (1977) placed significant limits on states' ability to exclude non-marital children from intestate inheritance. The Uniform Parentage Act and its revisions, adopted in various forms across states, further dismantled the classical framework. A researcher who encounters "inheritable blood" in a nineteenth-century American treatise or case is reading a doctrine that had been substantially modified or abolished by the time modern intestacy statutes were enacted.
Third, posthumous and assisted reproduction contexts. The concept resurfaces in modified form in contemporary disputes over whether children conceived posthumously through assisted reproduction can inherit from a deceased genetic parent. While no modern court uses the phrase "inheritable blood," the underlying question — whether a biological relationship carries the legal quality needed to transmit inheritance rights — is the same structural problem the old doctrine addressed. Researchers connecting historical intestacy doctrine to modern assisted reproduction disputes will find the conceptual lineage useful even where the vocabulary has changed entirely.
Fourth, corpus connections. References to inheritable blood in the Law Mind corpus appear predominantly in treatises on real property and descent (particularly those drawing on Blackstone and Kent) and in early state court decisions interpreting intestacy statutes. The term rarely appears after 1900 except in historical discussions.
Historical Dictionary Support
The four source dictionaries converge on the core definition: inheritable blood is blood possessing the legal quality that enables a person to stand in the character of heir and to transmit or receive an inheritance.
Black's (both editions) and Burrill are tightly aligned, emphasizing purity (freedom from attainder) and legitimacy as the two qualifying conditions. Bouvier is the most substantively useful of the group, adding the critical operational principle — that descendants can derive no title through a person whose blood is not inheritable — and explicitly flagging that attainder is not known in the United States. Bouvier's reference to 2 Blackstone's Commentaries 254–255 and 4 Kent's Commentaries 413–424 points researchers to the primary treatise sources where the doctrine is fully elaborated.
Burrill's entry is notable for a different reason: it appears to conflate two separate entries in the source text, appending a description of Scots law inhibition (a form of diligence against heritable property) to the English-law concept of inheritable blood. These are unrelated doctrines. Researchers using Burrill directly should recognize this as a transcription artifact and treat the Scots law material as belonging to a separate entry on inhibition.
None of the historical dictionaries fully account for the American constitutional abolition of corruption of blood or the twentieth-century statutory and constitutional erosion of the illegitimacy bar. They describe the doctrine as it stood in English common law and early American reception, not as it ultimately developed.
Jurisdictional Note
The attainder dimension of inheritable blood has no operative force anywhere in the United States by constitutional command. The illegitimacy dimension varied significantly by state throughout the nineteenth and twentieth centuries and was substantially reformed at different rates. Any research tracing specific inheritance claims through historical American sources must identify the applicable state's intestacy statute and its amendment history, rather than relying on the common-law baseline the historical dictionaries describe.
Encyclopedia Cross-Reference
Assisted Reproduction — Posthumous Reproduction and Inheritance Rights (The Law Mind Family Law Encyclopedia)