Explanation at your level:
An only son is a boy with no brothers or sisters. If you have no brothers and no sisters, you are an only child. If you are a boy, you are an only son. It is a simple way to talk about your family.
When you talk about your family, you can say, 'I am an only son.' This means your parents have no other sons. It is a very common way to describe your family members to friends or teachers.
The term only son is used to describe a male who has no siblings. In English, we often use this to clarify family relationships. It is helpful when someone asks if you have any brothers. You can reply, 'No, I am an only son.'
Using the term only son often implies a specific family dynamic. While it is a neutral descriptor, it can sometimes suggest that the person received more attention from their parents. It is a standard term used in biographical descriptions or personal introductions.
In more complex contexts, the only son is often discussed in relation to inheritance or family legacy. The term carries a nuance of responsibility, especially in traditional family structures where the only son is expected to maintain the family name or business.
The designation of only son is deeply rooted in social history. It reflects the transition from patriarchal inheritance systems to modern egalitarian family models. While the literal meaning remains the same, the cultural weight of the term has evolved significantly over the centuries.
Word in 30 Seconds
- An only son has no brothers or sisters.
- Use 'an' before the phrase.
- It is a neutral family descriptor.
- It is a countable noun phrase.
The term only son is a straightforward noun phrase used to identify a male child who has no siblings. When someone says, 'He is an only son,' they are telling you that he is the only boy born to his parents, and he has no brothers or sisters.
In many cultures, being an only son carries specific social or historical weight. It often implies that the child receives the full attention of his parents, but it can also mean he carries the full weight of family expectations. It is a very common way to describe family status in casual conversation.
The phrase is composed of two very old Germanic roots. Only comes from the Old English 'anlic,' meaning 'one-like' or 'sole.' Son traces back to the Proto-Germanic 'sunuz,' which is related to the Sanskrit 'sunu.' Both words have been staples of the English language for over a thousand years.
Historically, the concept of the only son was significant because of inheritance laws. In many societies, the only son was the automatic heir to the family name, land, and title. This historical importance has shaped how we view the term today, even in modern times where inheritance laws have become much more inclusive.
You will hear this phrase used in everyday life when people discuss their families. It is neutral in tone and perfectly acceptable in both formal and informal settings. You might say, 'He is an only son' to explain why he might be close to his parents.
Common collocations include devoted only son, spoiled only son, or the family's only son. It is almost always used as a predicate nominative or as part of a noun phrase. It is rarely used in plural because, by definition, there can only be one 'only' child per set of parents.
While there aren't many idioms specifically using these words, we often use phrases like 'the apple of his parents' eye' to describe an only son who is doted upon. Another expression is 'the sole heir,' which often refers to an only son in a legal context.
1. Sole survivor: Used when an only son is the last of his family. 2. Carrying the torch: Often said of an only son expected to continue a family business. 3. Center of attention: Frequently applied to an only child. 4. The golden boy: Sometimes applied to an only son with high expectations. 5. Family legacy: The weight an only son often carries.
The phrase only son functions as a singular noun phrase. You should use the indefinite article 'an' before it because 'only' begins with a vowel sound. For example: 'He is an only son.'
Pronunciation in American English is /ˈoʊnli sʌn/ and in British English it is /ˈəʊnli sʌn/. The stress is on the first syllable of 'only.' It rhymes loosely with 'lonely bun' or 'stony fun,' though these are not perfect rhymes. It is a countable noun phrase, but you would never say 'only sons' because the logic of the word 'only' precludes plurality for a single set of parents.
Fun Fact
The word 'only' comes from 'one-ly'.
Pronunciation Guide
Sounds like 'ohn-lee sun'
Sounds like 'ohn-lee sun'
Common Errors
- Pronouncing 'only' as 'on-lee'
- Mispronouncing 'son' as 'sun' (though they are homophones, the spelling is often confused)
- Forgetting the 'an' article
Rhymes With
Difficulty Rating
Very easy to read.
Simple to use.
Easy to pronounce.
Clear sounds.
What to Learn Next
Prerequisites
Learn Next
Advanced
Grammar to Know
Articles with Vowel Sounds
An only son
Subject-Verb Agreement
He is
Countable Nouns
One son, two sons
Examples by Level
He is an only son.
He / is / an / only / son
Use 'an' before 'only'
I am an only son.
I / am / an / only / son
Subject pronoun
My friend is an only son.
My / friend / is / an / only / son
Possessive adjective
The only son is happy.
The / only / son / is / happy
Definite article
She has an only son.
She / has / an / only / son
Verb 'has'
Is he an only son?
Is / he / an / only / son
Question form
No, he is not an only son.
No / he / is / not / an / only / son
Negative form
The only son lives here.
The / only / son / lives / here
Third person singular
He is the only son in his family.
Being an only son can be fun.
My cousin is an only son.
The only son went to school.
She loves her only son very much.
Is your brother an only son? No.
The only son plays soccer.
He is an only son and he is proud.
As an only son, he had a lot of time to himself.
The family's only son decided to move abroad.
He was the only son of a wealthy merchant.
Being an only son, he felt a lot of pressure.
The only son inherited the farm.
She treated her only son like a prince.
He is the only son, so he helps his parents.
Many people think being an only son is easy.
He was the only son of a long line of doctors.
The only son bore the responsibility of the family business.
Despite being an only son, he was very independent.
The only son was doted upon by his grandparents.
As the only son, he felt obligated to stay home.
The only son's inheritance was quite substantial.
She was protective of her only son.
He lived as an only son until his parents adopted.
The only son felt the heavy mantle of his father's expectations.
He was the only son in a family of five sisters.
The only son was the sole focus of the family's aspirations.
As the only son, he was the primary target of his mother's affection.
The only son found solace in his books.
He was the only son, yet he felt quite lonely.
The only son's life was dictated by tradition.
He was the only son, but he refused the family inheritance.
The only son was the final scion of a dying dynasty.
He was the only son, a fact that defined his entire upbringing.
As the only son, he was the repository of all family hopes.
The only son navigated the complexities of his unique status.
He was the only son, an anomaly in a family of daughters.
The only son was groomed for leadership from birth.
He was the only son, and the weight of the name was immense.
The only son was the sole survivor of the tragic accident.
Common Collocations
Idioms & Expressions
"Apple of one's eye"
Someone cherished above all others
As an only son, he was the apple of his mother's eye.
neutral"Sole heir"
The only person to inherit
He is the sole heir to the throne.
formal"Golden boy"
A successful or favored young man
He was the golden boy of the family.
casual"Carrying the name"
Continuing the family lineage
As an only son, he felt responsible for carrying the name.
neutral"Center of the universe"
The most important person
He felt like the center of the universe as an only son.
casualEasily Confused
Both mean no siblings
Only son is gender-specific
He is an only son, she is an only daughter.
Similar meaning
Lone is more poetic
The lone son returned home.
Often used together
Sole heir is about money
He is the sole heir.
Both relate to family
First-born can have siblings
He is the first-born of three.
Sentence Patterns
Subject + is + an + only son
He is an only son.
The only son of + [name]
He is the only son of John.
As an only son, [clause]
As an only son, he was loved.
Being an only son, [clause]
Being an only son, he had responsibilities.
He was the only son to + [verb]
He was the only son to finish the race.
Word Family
Nouns
Adjectives
Related
How to Use It
7
Formality Scale
Common Mistakes
Only son is singular.
Use 'an' before vowel sounds.
Redundant phrasing.
Confusing possessive with noun.
Usually implied.
Tips
The 'An' Rule
Always use 'an' before 'only'.
Family Context
Use it when discussing family size.
Flashcards
Put 'Only Son' on one side and 'No siblings' on the other.
Avoid Plural
Don't say 'only sons'.
Etymology
Only = One-ly.
Clear Vowels
Make sure to pronounce the 'o' clearly.
Visualization
Imagine the number 1 next to a boy.
Stereotypes
Be aware of the 'spoiled' stereotype.
Sentence Building
Practice saying 'I am an only son' until it flows.
Natural Flow
Link 'an' and 'only' together.
Memorize It
Mnemonic
O-S: Only Son. One-Son.
Visual Association
A single boy standing in a field.
Word Web
Challenge
Introduce yourself as an only son to a friend.
Word Origin
Germanic
Original meaning: One-like son
Cultural Context
None, but can sometimes imply pressure or privilege.
Commonly used in casual conversation to describe family status.
Practice in Real Life
Real-World Contexts
Family introductions
- I'm an only son.
- He's my only son.
Biographies
- He was the only son of...
- Born as an only son.
Inheritance discussions
- As the only son, he inherited.
Socializing
- Are you an only son?
Conversation Starters
"Are you an only son?"
"What is it like being an only son?"
"Do you know anyone who is an only son?"
"Is it better to be an only son or have siblings?"
"Why do people talk about being an only son?"
Journal Prompts
Write about what it means to be an only son.
Describe the pros and cons of being an only son.
If you were an only son, how would your life be different?
Write a story about an only son.
Frequently Asked Questions
8 questionsNo, an only son has no siblings.
No, it is two separate words.
No, always use 'an' because of the vowel sound.
No, it is a neutral description.
Only daughter.
Not necessarily, that is a stereotype.
Yes, very common.
Yes, if describing family history.
Test Yourself
He is ___ only son.
Use 'an' before a vowel sound.
What does 'only son' mean?
Only son means no brothers or sisters.
An only son can have a sister.
An only son has no siblings at all.
Word
Meaning
Matching terms to meanings.
He is an only son.
Score: /5
Summary
An only son is a boy with no siblings, and you should always remember to use 'an' before it.
- An only son has no brothers or sisters.
- Use 'an' before the phrase.
- It is a neutral family descriptor.
- It is a countable noun phrase.
The 'An' Rule
Always use 'an' before 'only'.
Family Context
Use it when discussing family size.
Flashcards
Put 'Only Son' on one side and 'No siblings' on the other.
Avoid Plural
Don't say 'only sons'.
