Definition
"Natural children" carries two distinct and historically competing meanings depending on legal context, jurisdiction, and era. Researchers must determine which sense applies before relying on any source.
1. Illegitimate children (common law and general usage). In most American common law sources, "natural children" means children born outside of lawful wedlock — that is, bastards in the historical legal sense. This is the primary definition in Bouvier's and the dominant meaning in 18th- and 19th-century American and English legal writing.
2. Children by blood, as opposed to adopted children (civil law usage). In Roman and civil law traditions, "natural children" distinguishes children born of the body from children brought into the family through legal adoption. Under this sense, a natural child may be either legitimate or illegitimate — the contrast is with the artificial legal relationship of adoption, not with the marital status of the parents.
3. Louisiana civil law usage (specific technical meaning). Louisiana's Civil Code introduced a third, narrower usage: illegitimate children who have been formally acknowledged or adopted by their father. This is neither the common law meaning nor the pure civil law meaning, but a hybrid category with specific inheritance and status consequences under Louisiana law.
Common Language
Modern common usage (Wiktionary): Plural of "natural child" — a child who is the biological offspring of a person, as distinguished from an adopted child.
Historical common usage (Webster's 1913): A child by birth; sometimes used to mean an illegitimate child.
The gap here is significant and cuts in multiple directions. Ordinary modern English uses "natural children" to mean simply biological children, with no implication of illegitimacy. Historical legal usage often meant precisely the opposite of legitimacy. And civil law usage aligns more closely with the modern common meaning than the common law legal meaning does. A researcher who imports modern common-language assumptions into a 19th-century legal text will likely misread the term entirely.
Common Confusion
Three meanings, same words. The central danger is assuming the term is stable across sources. A statute granting rights to "natural children" may mean illegitimate children (common law reading), biological as opposed to adopted children (civil law reading), or acknowledged illegitimate children (Louisiana reading). Courts have explicitly addressed this ambiguity: Bouvier's notes a case in which a statute granting adopted children the rights of "natural" children was held to use the term in the sense of legitimate children — meaning adopted children were being elevated to the status of those born in wedlock, not to the status of illegitimates. The meaning pivoted entirely on context.
Do not conflate "natural children" with "illegitimate children" as if they are always synonymous, and do not assume the modern biological-versus-adopted distinction applies to historical texts.
Why It Matters in Research
Jurisdictional and temporal instability make this term a research hazard. A document from a civil law jurisdiction, a common law jurisdiction, and Louisiana may each use "natural children" to mean something different — and two of those three meanings are nearly opposite.
In inheritance research, the stakes are high. Whether a "natural child" takes under a will or intestate succession depends entirely on which definition the drafting court or legislature had in mind. Pre-20th-century wills and statutes that use this term without further qualification require careful attention to the jurisdiction and period before any conclusion about who qualifies.
Statutory construction cases from the 19th and early 20th centuries frequently turned on this ambiguity. Bouvier's own entry signals the problem by citing the 9 Am. L. Reg. 747 discussion, where the word's meaning in a specific statute was contested.
Louisiana researchers face a compounded problem: the Louisiana Civil Code used "natural children" in a technical sense tied to acknowledgment by the father, which does not map cleanly onto either common law illegitimacy or the civil law adoption contrast. Articles of the Louisiana Civil Code in force through the 19th and into the 20th century must be read in that specific statutory context.
Modern family law has largely moved away from the term. Contemporary statutes and court decisions tend to use "biological child," "illegitimate child," or "nonmarital child" rather than "natural child," reducing but not eliminating the interpretive problem in current materials.
When searching Law Mind corpus materials, expect the term to appear most heavily in: probate and succession documents, 19th-century statutory compilations, civil law treatises, and Louisiana primary sources. Flag every instance for contextual analysis before treating the definition as settled.
Historical Dictionary Support
Bouvier's Law Dictionary provides the most useful synthesis of the competing meanings, and its entry is notable for acknowledging the instability rather than papering over it. Bouvier leads with the illegitimacy definition — "bastards; children born out of lawful wedlock" — then immediately flags the statutory construction problem, and then pivots to the civil law and Louisiana meanings. This structure reflects genuine doctrinal complexity, not editorial sloppiness.
What Bouvier does not do is resolve the hierarchy between the meanings or offer guidance on which to apply in ambiguous cases. That gap is the researcher's burden. Historical dictionaries generally treat "natural children" as a term of art whose content is supplied by the jurisdiction and context — which is accurate but unhelpful when the jurisdiction or context is itself the subject of inquiry.
Black's Law Dictionary (later editions) follows a similar pattern, distinguishing the illegitimacy meaning from the biological-versus-adopted meaning, though with less attention to the Louisiana civil law particularity.
Jurisdictional Note
The common law illegitimacy meaning dominated in most American states through the early 20th century. Civil law jurisdictions, including Louisiana and to some extent states with Spanish or French colonial legal heritage, applied the distinction from adoption rather than from wedlock. Louisiana's specific code definition adds a third layer unavailable elsewhere. Modern uniform acts and family law reform statutes have generally abandoned the term in favor of more precise language, making it primarily a historical research concern in contemporary materials.
Encyclopedia Cross-Reference
The Law Mind Family Law Encyclopedia: Child Support — Support for Children with Special Needs (family_95) — relevant for modern contexts where biological versus legal parentage affects support obligations.