Family and People in Irish

In Brief

Irish family words often change after mo “my”, do “your” and a “his/her/their”: máthair becomes mo mháthair, while athair becomes m’athair. Irish also expresses “have” with Tá ... agam (“... is at me”), as in Tá deartháir agam “I have a brother.”

Overview

Talking about relatives brings several essential pieces of Irish together. You need the family noun itself, but you also need to choose a possessive such as mo “my” or do “your” and sometimes alter the noun’s first sound. These changes are called initial mutations (changes made at the beginning of a word). The most frequent one in this topic is lenition, or séimhiú, usually written by adding h after the first consonant: máthair → mháthair.

This is an A1 topic because it supports immediate, practical sentences: introducing your sister, saying you have two sons, or asking someone’s father’s name. It also gives you a useful first encounter with a major difference between Irish and English. English possessives do not alter the following noun; Irish possessives often do.

A second difference concerns “have.” Irish normally does not build possession around a direct equivalent of the English verb “have.” Instead, a person or thing is said to be at someone: Tá iníon agam, literally “A daughter is at me,” is the ordinary way to say “I have a daughter.” Learn this as a complete Irish pattern rather than translating each word mechanically.

How It Works

Core family vocabulary

A noun is a naming word for a person, place or thing. Irish nouns have grammatical gender, which matters when you introduce someone with seo é or seo í and in some more advanced structures.

Irish	English	Useful phrase
teaghlach	family, household	mo theaghlach — my family
athair	father	m’athair — my father
máthair	mother	mo mháthair — my mother
tuismitheoir	parent	mo thuismitheoir — my parent
tuismitheoirí	parents	mo thuismitheoirí — my parents
deartháir	brother	mo dheartháir — my brother
deirfiúr	sister	mo dheirfiúr — my sister
mac	son	mo mhac — my son
iníon	daughter	m’iníon — my daughter
fear céile	husband	m’fhear céile — my husband
bean chéile	wife	mo bhean chéile — my wife
seanathair	grandfather	mo sheanathair — my grandfather
seanmháthair	grandmother	mo sheanmháthair — my grandmother
páiste	child	mo pháiste — my child
leanaí	children	mo leanaí — my children

Irish can distinguish family as a household or family unit (teaghlach) from relatives or kin more broadly (muintir in many contexts). At beginner level, teaghlach is the safest core word for talking about your family as a group.

Introducing a person: seo é and seo í

Use Seo é ... when presenting a male person and Seo í ... when presenting a female person. These expressions are naturally translated as “This is ...” even though English uses the neutral word “this.”

• Seo é mo dheartháir. — This is my brother.
• Seo í mo dheirfiúr. — This is my sister.

With a name, the same pattern works: Seo é Cian and Seo í Aoife. In everyday speech, you may also hear simply Seo Cian, but learning seo é/í helps you build reliable complete sentences.

“My” and “your”: mo and do

Before most consonants, mo “my” and singular do “your” cause lenition. Not every consonant can show lenition in spelling, but the family words below do:

Basic noun	My	Your (singular)
máthair	mo mháthair	do mháthair
deartháir	mo dheartháir	do dheartháir
deirfiúr	mo dheirfiúr	do dheirfiúr
mac	mo mhac	do mhac
páiste	mo pháiste	do pháiste

Before a vowel, mo and do lose their vowel and take an apostrophe:

• athair → m’athair, d’athair
• iníon → m’iníon, d’iníon

The apostrophe is not optional decoration: write m’athair, not mo athair, in standard usage.

The three meanings of a

Irish a can mean “his,” “her” or “their.” The mutation tells you which meaning is intended.

Meaning	Before a consonant	Before a vowel
his	lenition: a mháthair	no prefix: a athair
her	no lenition: a máthair	h-: a hathair
their	eclipsis: a máthair does not visibly distinguish every consonant; a ndeartháir shows it	n-: a n-athair

Eclipsis, or urú, is another initial mutation: a new sound is written before the original first consonant, as in deartháir → ndeartháir. Notice that some written forms can still be ambiguous. A máthair may mean “her mother,” while the same spelling can also occur for “their mother” because m does not display eclipsis in standard spelling. Context resolves the meaning.

For a beginner, the easiest contrast to memorise is:

• a mháthair — his mother
• a máthair — her mother
• a athair — his father
• a hathair — her father
• a n-athair — their father

Saying that you have relatives

Use Tá + relative + ag-form. The ag-form is a prepositional pronoun: a preposition (“at”) combined with a person (“me,” “you,” and so on).

Irish pattern	Meaning
Tá deartháir agam.	I have a brother.
Tá deirfiúr agat.	You have a sister.
Tá mac aige.	He has a son.
Tá iníon aici.	She has a daughter.
Tá páistí againn.	We have children.
Tá beirt deartháireacha acu.	They have two brothers.

The owner comes at the end. Do not try to insert an Irish equivalent of English “have” between the person and the relative.

Counting people

Irish commonly uses special personal numbers for small groups of people. Beirt means “two people” and is followed by the singular form of the noun, with lenition where possible:

• beirt mhac — two sons
• beirt deirfiúracha — two sisters
• beirt iníon — two daughters

This is why Tá beirt mhac agam contains mhac, not the ordinary plural mic. Personal-number patterns continue beyond two, but they are best learned as a separate number system. At A1, treating beirt + person noun as one useful unit is enough.

Names and where someone lives

To ask a person’s name, Irish uses Cad is ainm duit? — literally, “What name is to you?” When asking about a relative, do can mean “to,” while the possessive immediately after it can be shortened before a vowel:

• Cad is ainm do d’athair? — What is your father’s name?
• Cad is ainm do do mháthair? — What is your mother’s name?

To say where someone lives, a common expression is Tá ... ina chónaí/ina cónaí .... Traditionally ina chónaí is used of a male person and ina cónaí of a female person:

• Tá m’athair ina chónaí i nGaillimh. — My father lives in Galway.
• Tá mo mháthair ina cónaí i gCorcaigh. — My mother lives in Cork.

The place name may also mutate after i “in,” as Corcaigh → i gCorcaigh. That mutation belongs to the grammar of prepositions, not to the family noun itself.

Examples in Context

Irish	English	Note
Seo í mo dheirfiúr.	This is my sister.	Female person: seo í; mo lenites deirfiúr.
Seo é mo dheartháir, Seán.	This is my brother, Seán.	Male person: seo é.
Tá deirfiúr agam.	I have a sister.	The owner is expressed by agam.
Tá beirt mhac agam.	I have two sons.	Beirt is a personal number and lenites mac.
An bhfuil páistí agat?	Do you have children?	The question form uses An bhfuil ...?
Níl páistí aici.	She does not have children.	Níl makes the pattern negative; aici means “at her.”
Cad is ainm do d’athair?	What is your father’s name?	d’athair is “your father.”
Ciarán is ainm do mo dheartháir.	My brother’s name is Ciarán.	Literally, “Ciarán is the name to my brother.”
Tá mo mháthair ina cónaí i gCorcaigh.	My mother lives in Cork.	Traditional feminine form ina cónaí.
Tá m’athair ina chónaí i nGaillimh.	My father lives in Galway.	Mo contracts before the vowel in athair.
Is í Nóra a máthair.	Nóra is her mother.	No lenition after feminine “her.”
Is é Pól a hathair.	Pól is her father.	“Her” prefixes h to a vowel.
Tá a mhac ar scoil.	His son is at school.	“His” lenites mac.
Tá a n-iníon sa bhaile.	Their daughter is at home.	“Their” prefixes n- before a vowel.

Common Mistakes

Leaving the noun unchanged after mo or do

• Wrong: mo máthair
• Right: mo mháthair
• Why: Mo normally causes lenition before a consonant that can be lenited. The written h records a real change in pronunciation.

Keeping mo in full before a vowel

• Wrong: mo athair
• Right: m’athair
• Why: Before a vowel, mo contracts to m’. In the same way, do iníon becomes d’iníon.

Treating all forms of a as identical

• Wrong: a mháthair for “her mother”
• Right: a máthair
• Why: “His” lenites a following consonant; “her” does not. Therefore a mháthair is “his mother,” but a máthair is “her mother.”

Translating “have” word for word

• Wrong: Mé tá deartháir for “I have a brother”
• Right: Tá deartháir agam.
• Why: Irish expresses possession with Tá ... agam, placing the thing possessed before the owner.

Using an ordinary plural after beirt

• Wrong: beirt mic
• Right: beirt mhac
• Why: Beirt is followed here by the singular noun, and it causes lenition where possible.

Mixing up seo é and seo í

• Wrong: Seo é mo dheirfiúr.
• Right: Seo í mo dheirfiúr.
• Why: Use é for a male person and í for a female person in this introducing pattern.

Usage Notes

English often distinguishes relatives through compound words such as “grandmother” and “grandfather.” Irish does this too: sean- combines with máthair and athair in seanmháthair and seanathair. However, actual families may use affectionate forms and personal nicknames that do not map neatly onto a dictionary list.

Teaghlach commonly points to the family or household as a unit. Muintir has a broader range and can mean one’s people, family, inhabitants or community depending on context. For a simple introduction such as “I have a large family,” Tá teaghlach mór agam is clear and useful.

Irish varies by dialect, and pronunciation of lenited consonants can differ across regions. The spelling patterns taught here belong to the shared written standard and remain worth learning even when speakers’ pronunciations differ. In speech, possessives may also be reduced, so listening for the mutation on the noun is often as important as hearing the small word before it.

Modern speakers do not all use gendered ina chónaí/ina cónaí in exactly the same way. The traditional contrast is useful for comprehension and remains common, but local and personal usage may vary.

Beyond the Basics / Advanced Use

You do not need to master all possessives yet, but the family pattern belongs to a larger system. Ár “our,” bhur “your (plural)” and a “their” normally cause eclipsis: ár ndeartháir “our brother,” bhur mac “your son” (no visible change is available on initial m), and a ndeirfiúr “their sister.” Before a vowel, all three use n-: ár n-athair, bhur n-iníon, a n-athair.

Irish can also express relationships with the copula is, a linking form used to identify or classify someone:

• Is í Máire mo dheirfiúr. — Máire is my sister.
• Is é Liam a hathair. — Liam is her father.

Here í or é agrees with the person being identified. These sentences are more structured than the beginner introduction Seo í Máire, but they are frequent and useful.

Terms for relationships and households also reflect real social variety. You may meet leathdheartháir “half-brother,” leathdeirfiúr “half-sister,” or descriptive phrases for partners and blended families. Mutation rules still apply to the first mutable sound: mo leathdheartháir. Vocabulary choices can vary, so when discussing someone’s own family, follow the terms that person uses.

Finally, kinship nouns can appear in direct address and fixed expressions, where dialect and older grammatical patterns may affect the form. Recognising ordinary possessives and Tá ... agam should come first; treat vocative forms (forms used when speaking directly to someone) as a later topic rather than trying to derive them from English.

Practice Tips

1. Build a small family map. Label each person twice: first with mo (mo mháthair, m’athair), then from another person’s perspective with a. This makes the mutation carry real meaning rather than becoming an abstract spelling exercise.
2. Practise a three-part introduction aloud: Seo í/é ..., ... is ainm dó/di, and Tá sé/sí ina chónaí/cónaí .... Change one detail at a time while keeping the sentence frame stable.
3. Make paired cards for the basic noun and possessed form: deirfiúr → mo dheirfiúr, athair → m’athair. Say both aloud so that you learn the sound change as well as the added h or apostrophe.

Related Concepts

• Prerequisite: Possession — introduces Tá ... agam, possessive words and the mutations they trigger.