Definition
Natural affection is the love and tenderness that the law presumes to exist between persons who are closely related by blood or marriage — such as parent and child, sibling and sibling, or husband and wife. It is not a sentiment the law attempts to measure or prove; rather, it functions as a legal presumption that arises from the relationship itself.
The term has doctrinal significance primarily in the law of contracts and conveyances. Natural affection is classified as a "good consideration" — meaning it is legally recognized as a reason for making a promise or transferring property — but it is distinguished from "valuable consideration," which involves something of economic worth exchanged between the parties. This distinction carries practical consequences: a deed or covenant supported only by natural affection will generally be enforced between the parties, but it may not protect a grantee against the claims of the grantor's creditors or subsequent purchasers for value.
Common Language
Modern common usage (Wiktionary): The natural love and affection felt between close relatives; an instinctive emotional bond between family members.
Historical common usage (Webster's 1913): The affection which naturally subsists between parents and their offspring, and between near kindred generally; natural parental or filial love.
The common and legal meanings are closely aligned in their descriptive content — both refer to the presumed emotional bond between near relatives. The legal gap lies in function: in law, natural affection is not merely a sentiment but a formal category of consideration that determines whether an instrument is enforceable, who can enforce it, and how it fares against competing claims. A researcher reading "natural affection" in a deed or covenant is encountering a legal term of art with defined transactional consequences, not simply a recitation of family feeling.
Common Confusion
Natural affection is often conflated with moral obligation or past consideration, since all three can support a promise without involving a present economic exchange. They are distinct. Moral obligation arose from a prior benefit received and sometimes supported an implied promise to repay; past consideration is generally not consideration at all under modern doctrine. Natural affection, by contrast, is a good consideration in its own right, grounded in the relational status of the parties rather than in any prior transaction. Researchers should also distinguish "good consideration" from "valuable consideration" — the historical sources use both terms, but the legal consequences differ significantly, particularly in disputes involving creditors.
Why It Matters in Research
Natural affection appears most frequently in older equity and conveyancing materials, particularly in the context of deeds, bargains and sale, and covenants to stand seised to uses — two instruments that historically required only good consideration (as opposed to valuable consideration) to be effective. Researchers working with pre-twentieth-century deed records, Chancery proceedings, or treatises on uses and trusts will encounter natural affection as a routine recital, but its presence signals something about the instrument's vulnerability: conveyances supported by natural affection alone were targets for creditors asserting fraudulent conveyance claims, since the absence of valuable consideration was evidence the transfer was voluntary.
The term largely disappears from modern practice because the formal distinction between "good" and "valuable" consideration has collapsed in most American jurisdictions, and modern contract doctrine generally requires valuable consideration. When natural affection appears in contemporary legal materials, it is almost always in the context of interpreting historical instruments or in family law discussions about the enforceability of intrafamily agreements.
Researchers should be alert to the fact that historical sources treat natural affection as adequate consideration for some purposes but inadequate for others, and the line varies by instrument type and jurisdiction. A statement that natural affection "is a good consideration" in one source does not mean it was treated as equivalent to valuable consideration in all contexts — the historical dictionaries summarize a more nuanced body of doctrine.
Historical Dictionary Support
The three shelf sources are in agreement on the core proposition: natural affection is a good consideration for certain instruments, particularly deeds. Black's identifies the relevant relationships — parent and child, sibling, spouse — and notes the law's recognition of the concept. Rapalje & Lawrence confirm it is "a good consideration for certain purposes," with a cross-reference to the consideration entry that reflects the bounded nature of that recognition. Bouvier is the most specific, noting that natural affection "sometimes supplies the place of a valuable consideration in contracts" and that it is sufficient consideration for a deed, citing Stephens' Commentaries.
Bouvier's cross-references to bargain and sale and covenant to stand seised are particularly useful navigational signals: those were the two major conveyancing instruments under the Statute of Uses (1535) that relied on good consideration rather than the common law's requirement of livery of seisin. Natural affection functioned as the operative consideration in those instruments, explaining why the term is so prevalent in historical conveyancing records.
What the historical dictionaries collectively understate is the vulnerability of instruments supported only by natural affection in fraudulent conveyance analysis, and the modern obsolescence of the doctrine. They present the term as settled and functional; modern researchers should understand it as historically operative but largely archaic.
Jurisdictional Note
The weight given to natural affection as consideration varied across American states, particularly in equity courts addressing voluntary conveyances. Some states treated a deed supported solely by natural affection as constructively fraudulent as to existing creditors; others required proof of actual fraudulent intent. Researchers working with nineteenth-century state court materials should consult jurisdiction-specific equity rules rather than relying on the general formulations in the shelf dictionaries.