Definition
In law, a daughter is an immediate female descendant of a person. The term appears most frequently in wills, trusts, intestacy statutes, and family law instruments where the scope of inheritance, guardianship, or parental rights turns on whether a given individual qualifies as a "daughter" of the decedent or party in question.
The apparent simplicity of the definition conceals significant interpretive range. Courts have extended the term beyond its baseline meaning in several directions:
1. IMMEDIATE FEMALE DESCENDANT (baseline): The default legal meaning, used in instruments that do not otherwise expand or qualify the term. A granddaughter does not qualify under this reading unless the instrument expressly includes her.
2. EXTENDED TO ISSUE OF A DAUGHTER: Where context, instrument language, or equitable construction supports it, courts have read "daughter" to include a daughter's own children — that is, the grandchildren of the testator through a female line. This expansion is construction-dependent and not automatic.
3. NATURAL OR ILLEGITIMATE FEMALE CHILD: Courts have recognized that "daughter" may designate an illegitimate female child, particularly where the instrument or statute does not restrict the term to lawful issue. The question of whether an illegitimate child falls within the term has been answered differently across eras and jurisdictions.
4. DAUGHTER-IN-LAW: In older usage — biblical and early common law — "daughter" sometimes designated a son's wife. This usage is now archaic in legal instruments but appears in historical sources and must be read carefully.
Common Language
Modern common usage (Wiktionary): One's female offspring; a female descendant; also used as a familiar address from an older or more authoritative person to a younger female.
Historical common usage (Webster's 1913): The female offspring of the human species; a female child of any age; a female descendant; also, a son's wife (daughter-in-law).
The gap between common and legal meaning is real but subtle. Ordinary speakers use "daughter" to mean an immediate female child, and so do most legal instruments — but legal construction has repeatedly been called upon to decide whether the word stretches to include granddaughters, illegitimate children, or adopted children. Common usage does not resolve these questions, and a researcher relying on the intuitive meaning will miss the interpretive history that courts have built around the term.
Common Confusion
DAUGHTER vs. ISSUE: "Issue" is the broader term encompassing all lineal descendants, male or female, of any generation. "Daughter" is narrower and gender-specific, and in its strict legal sense is limited to the immediate generation. Instruments using "daughter" where "issue" was intended — or vice versa — have generated substantial litigation over inheritance rights. Researchers should not treat the terms as interchangeable.
DAUGHTER vs. DAUGHTER-IN-LAW: Modern legal instruments uniformly distinguish these. The conflation is an artifact of older usage (Ruth 1:11 is the standard biblical example) and appears in some historical dictionary sources. It has no operative significance in contemporary drafting but is a trap in reading older wills and historical case law.
Why It Matters in Research
The deceptive simplicity of "daughter" is a recurring research trap. The term appears constantly in probate and family law records, but its meaning has shifted across three distinct axes — generational reach, legitimacy, and adoption — and courts have not always agreed on any of them.
GENERATIONAL REACH: Historical cases split on whether "daughter" in a will included grandchildren when the named daughter predeceased the testator. The "immediate female descendant" formula in Black's and Bouvier's reflects the strict reading, but cases like Buchanan v. Lloyd extended the term to issue of a daughter where context supported it. Researchers examining 19th-century probate records should not assume the strict reading governed.
LEGITIMACY: The recognition that "daughter" may include an illegitimate female child (State v. Laurence) reflects an older equitable tradition that predates modern statutory reform. Most jurisdictions have now addressed the rights of nonmarital children by statute, substantially displacing the common law case-by-case approach. Researchers working across the legitimacy reform period (roughly 1960s–1990s in most U.S. jurisdictions) will find the case law and statutory frameworks in tension and should identify which regime controlled at the relevant time.
ADOPTION: Historical dictionary sources are silent on adopted daughters, reflecting the underdeveloped state of adoption law when these entries were written. Modern instruments and intestacy statutes in most jurisdictions treat adopted children identically to biological children for purposes of inheritance, but historical records will not reflect this, and older instruments may expressly exclude or include adoptees. This is a gap the historical dictionaries cannot fill.
CORPUS CONNECTIONS: "Daughter" cross-connects heavily with terms governing descent and distribution, heirship, legitimacy, intestate succession, and guardianship. In family law, it appears in custody and support instruments where the identity of a "daughter" relative to a particular parent is disputed (paternity, adoption, stepparent relationships). Researchers should trace the specific instrument or statute generating the question rather than relying on the dictionary definition alone.
Historical Dictionary Support
Black's (1st Ed.) and Bouvier agree entirely on the baseline: "an immediate female descendant" or "a female child; an immediate female descendant." These formulations are minimal and tell the researcher what the term means at its core but nothing about how courts applied it at the margins.
Black's (2nd Ed.) is substantially more useful. It moves from definition to application, citing cases for three distinct propositions: that "daughter" may include the issue of a daughter (Buchanan v. Lloyd); that "daughter" may designate a natural or illegitimate female child (State v. Laurence); and that "daughter" in its strict sense means an immediate female descendant (People v. Kaiser). This edition signals that the term was already the subject of active judicial construction by the turn of the 20th century.
All three historical sources are silent on adopted daughters — an expected omission given the era, but one that matters for researchers working with 20th-century instruments. The historical entries also do not address the impact of legitimacy reform statutes, uniform acts, or constitutional developments (particularly the Supreme Court's equal protection cases on nonmarital children from the 1970s onward) that reshaped who qualifies as a "daughter" for inheritance purposes.
Jurisdictional Note
Modern intestacy statutes — particularly those adopting Uniform Probate Code provisions — have largely resolved the legitimacy and adoption questions by statute, treating all children equally regardless of marital status or biological connection. Jurisdictions that have not adopted the UPC may still apply older common law presumptions. Researchers should identify the controlling statute for the jurisdiction and time period in question before relying on case law constructions of the term.