Vietnamese family titles on Mom's side vs Dad's side

Vietnamese family titles change depending on which side of the family a relative is on: your dad's side uses words like chú, cô and thím, while your mom's side uses cậu, dì and mợ. Grandparents are split too, with nội for your father's parents and ngoại for your mother's.

English lumps everyone into "aunt" and "uncle." Vietnamese tells you the side, often the age and sometimes the marriage, all in one word. Here's the map.

Grandparents on each side

• Dad's side: ông nội (grandfather), bà nội (grandmother)
• Mom's side: ông ngoại (grandfather), bà ngoại (grandmother)

Nội means "inside" and ngoại means "outside," a leftover from a traditional, father-centered family system. For more on these words, see Ông and bà: grandparents and elders in Vietnamese.

Aunts and uncles on Dad's side

• Bác: your father's older brother or sister. People add trai (male) or gái (female) if needed.
• Chú: your father's younger brother.
• Cô: your father's younger sister. In many Southern families, cô covers all of your father's sisters regardless of age.
• Thím: the wife of a chú.
• Dượng (South) or chú (North): the husband of a cô.
• Bác gái / bác trai: the spouse of a bác.

Pronunciation hints: chú is "choo" with a rising tone, cô is "koh" with a flat tone, thím is "teem" with a rising tone.

Aunts and uncles on Mom's side

• Bác: your mother's older sibling, mainly in the North.
• Cậu: your mother's brother. In the South, cậu usually covers all of her brothers, older or younger.
• Dì: your mother's sister. In the South, dì usually covers all of her sisters.
• Mợ: the wife of a cậu.
• Dượng or chú: the husband of a dì.

Pronunciation hints: cậu is like "cow" with a low, heavy tone; dì is "zee" in the North or "yee" in the South, with a falling tone; mợ is like "muh" with a low, heavy tone.

How do the North and South differ?

The biggest split is how age works:

• In the North, anyone older than your parent, on either side, is generally bác. Younger siblings get the side-specific word: chú or cô on Dad's side, cậu or dì on Mom's.
• In the South, the side matters more than age. On Dad's side, his older brother is still bác and his younger brother is chú, but his sisters are often all cô. On Mom's side, her brothers are cậu and her sisters are dì, regardless of age.

Southern families also commonly add birth-order numbers, starting with Hai (two) for the eldest child rather than one. So your mother's eldest sister might be dì Hai, the next dì Ba, and so on. Several explanations for starting at Hai are told, and none is settled, so treat any single story with caution.

These are general patterns. Individual families, especially those that moved between regions or abroad, often blend both systems. If you're unsure, ask an older relative what they want to be called. They usually love the question.

Cousins and siblings

Vietnamese doesn't have a single word for "cousin." Instead, cousins use sibling words based on whose parent is older:

• Anh (older brother) and chị (older sister)
• Em (younger sibling)

The twist is that the ranking often follows the parents, not your actual ages. If your mom is the older sister of your cousin's mom, you may be the anh or chị even if your cousin was born first. Many families do it this way; some just go by age. To specify, people add họ, as in anh họ (a male cousin who ranks older). Our guide to anh vs em explains the age logic.

A quick cheat sheet

• Dad's parents: ông nội, bà nội
• Mom's parents: ông ngoại, bà ngoại
• Dad's younger brother / his wife: chú / thím
• Dad's sister: cô
• Mom's brother / his wife: cậu / mợ
• Mom's sister / her husband: dì / dượng
• Parent's older sibling (especially North): bác

Why this matters at family gatherings

At a big gathering such as Tết, these titles do a lot of work. They tell everyone at a glance how people are related and who should be greeted first. Using the right title for an aunt or uncle shows you know where you fit, and getting it wrong usually earns a laugh and a quick correction rather than offense.

Before your next family event, sketch a quick family tree with each relative's title written in. It takes ten minutes and saves a lot of nervous guessing at the door.