Irish Family Relationship Terms

Father's father

Daideo

Irish (Gaeilge). No split by paternal vs maternal in everyday use.

Father's mother

Móraí / Mamó

Mother's father

Daideo

Mother's mother

Móraí / Mamó

Father

Daidí

Formal: Athair

Mother

Mamaí

Formal: Máthair

Father's older brother

Uncail

No split by side of the family or age; a borrowed word, same as English 'uncle.'

Father's younger brother

Uncail

Father's sister

Aintín

Mother's older brother

Uncail

Mother's younger brother

Uncail

Mother's sister

Aintín

Father's older brother's wife

Aintín

Father's younger brother's wife

Aintín

Mother's brother's wife

Aintín

Father's sister's husband

Uncail

Mother's sister's husband

Uncail

Older brother

Deartháir

Younger brother

Deartháir

Older sister

Deirfiúr

Younger sister

Deirfiúr

Father's brother's son

Col Ceathrair

Literally 'fourth-degree kinship': Irish's own word for first cousin, not split by side of the family.

Father's brother's daughter

Col Ceathrair

Father's sister's son

Col Ceathrair

Father's sister's daughter

Col Ceathrair

Mother's brother's son

Col Ceathrair

Mother's brother's daughter

Col Ceathrair

Mother's sister's son

Col Ceathrair

Mother's sister's daughter

Col Ceathrair

Son

Mac

Daughter

Iníon

Grandson

Garmhac

The 'gar-' prefix means 'one generation removed,' the same logic as English 'grand-.'

Granddaughter

Gariníon

Son-in-law

Cliamhain

Daughter-in-law

Banchliamhain

Brother's son

Nia

Sister's son

Nia

Brother's daughter

Neacht

Sister's daughter

Neacht

Husband

Fear Céile

Wife

Bean Chéile

Spouse's father

Athair Céile

Spouse's mother

Máthair Chéile

Husband's older brother

Deartháir Céile

Husband's younger brother

Deartháir Céile

Husband's sister

Deirfiúr Chéile

Wife's brother

Deartháir Céile

Wife's sister

Deirfiúr Chéile

Brother's wife

Deirfiúr Chéile

Sister's husband

Deartháir Céile