Your niece’s husband does not have a single, universal term in French. Depending on the register used (everyday conversation, genealogical research, civil law), the word changes or simply does not exist. This lack of consensus generates confusions that we will clarify.
Three registers, three ways to name your niece’s husband
The applicable term depends on the context of use. Mixing everyday language, genealogical vocabulary, and legal terminology remains the primary source of error on this subject.
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In casual usage, the phrase “my niece’s husband” dominates. Descriptive and clear, it works in any informal situation without the risk of misunderstanding.
In genealogy, the term “nephew by marriage” is used. The reasoning is simple: any person who enters the family through marriage is given the title of in-law, and then is assigned the degree of kinship of their spouse.
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In French civil law, there is no dedicated term for the spouse of a nephew or niece. The Civil Code names direct in-laws (son-in-law, daughter-in-law, in-laws), but the collateral line beyond the first circle does not benefit from such lexical precision.
Your niece’s husband is therefore neither your “son-in-law” (reserved for your daughter’s husband) nor your “brother-in-law” (a term absent from legislative texts). On an administrative or inheritance document, the phrase “husband of my niece [First Name Last Name]” remains the most reliable. To better understand how to address my niece’s husband in each context, regional usages should also be taken into account.
Nephew by marriage: a genealogical term often misinterpreted
Genealogy resonates by symmetry. You are the uncle or aunt of your niece; by extension, her husband becomes your nephew by marriage, and you become his aunt or uncle by marriage.
This mechanism applies to all collateral relationships created by marriage. Your first cousin’s husband is your “cousin by marriage.” The suffix “by marriage” replaces the blood relationship while maintaining the same degree.
The confusion often arises from the prefix “brother-in-law.” The terms “brother-in-law” and “sister-in-law” are well established, leading some to create “brother-in-law” by analogy. This word does not appear in reference dictionaries or in the kinship lexicon of French-speaking genealogists. We advise against using it in any formal context.
Degree of marriage in the collateral line
The degree of marriage is calculated like the degree of kinship of the spouse. In civil law, degrees in the collateral line are counted by going up to the common ancestor and then down again. Your niece, the daughter of your brother or sister, is at the third degree in the collateral line according to this civil count. Her husband is therefore your relative at the same degree.
- In matters of inheritance, in-laws do not inherit by default. Your niece’s husband has no rights to your estate, unless expressly stated in a will.
Kinship by marriage: vocabulary traps to know
Several terms circulate on forums without all being correct. Some clarifications are necessary.
“Son-in-law” never refers to the husband of a niece. This term is reserved for the husband of a person’s daughter. Using it for your niece’s husband creates confusion regarding generation and degree.
“Brother-in-law” has no lexicographical existence in standard French. It occasionally appears in online discussions, by analogy with “brother-in-law,” but no reference dictionary lists it.
“In-law” used alone, without specifying the degree, remains too vague. This word encompasses all individuals related by marriage, from father-in-law to the spouse of a first cousin.
The correct formulation according to the context
- Everyday conversation: “my niece’s husband” (descriptive, unambiguous)
- Family tree or announcement: “nephew by marriage” (recognized technical term)
- Legal or notarial document: “husband of [First Name Last Name], my niece” (the safest administrative formulation)
- Affective usage: simply the first name, which includes the person without a label
Degree of kinship and marriage: when the choice of word has a legal impact
The degree of marriage conditions concrete rights and obligations in several situations. The question goes far beyond vocabulary.
In matters of inheritance, the distinction between blood kinship and kinship by marriage modifies the applicable taxation. A nephew by blood and a nephew by marriage are not treated the same way by the tax administration during a donation or transfer. This asymmetry regularly surprises families wishing to transfer an asset to the spouse of a nephew or niece.
The precision of terminology conditions the drafting of a will, the calculation of transfer taxes, and the validity of certain procedures. Using the correct term at the right time avoids costly mistakes at the notary’s office.
French does not have a unique word for this relationship. This is not a shortcoming: it reflects a legal system that clearly distinguishes direct in-laws (son-in-law, daughter-in-law) from collateral in-laws, for whom a descriptive periphrasis remains the norm.