A child who understands your home language but answers in English or Vietnamese has not lost the language. They have become what researchers call a passive or receptive bilingual: the language is stored, but the child has learned that speaking it is optional. This is very common a few months after a child starts a full-day preschool in other languages. It is usually reversible when the home language gets more hours, more speakers and situations where it is genuinely needed, and when parents avoid turning it into a battle.
This guide is for expat and mixed-nationality families in Ho Chi Minh City who are watching a home language such as Spanish, Korean, Hindi or Dutch slip into the background. It starts by sorting out the likely causes, lists the responses that tend to backfire, lays out a staged plan for bringing the language back, and explains the role of trips home and visiting relatives. It also covers a question many parents avoid: when it makes sense to adjust the goal rather than push harder.
What is actually happening
Understanding a language and speaking it are separate skills that develop at different speeds. Understanding needs input: hearing the language often, in meaningful situations. Speaking needs input plus practice plus a reason to make the effort. When a child spends most of the day in Vietnamese and English, the effort of finding words in the home language rises, while the reward for using it falls, because the parent who speaks it also understands English.
Children are efficient communicators. If an English answer gets the same result as a home-language answer, the child will often take the easier path, especially when tired. Over weeks this becomes a habit. The child may still enjoy stories in the home language, follow instructions in it and laugh at jokes, but replies come in another language. Some children even feel mildly embarrassed when asked to speak the home language, because they sense that it no longer flows as easily as before.
Annick De Houwer's research on families in Flanders, published in 2007, found that roughly a quarter of children growing up with two home languages spoke only the majority language. Many of them understood the other language. The pattern is so common that it should not be read as a failure of the child or of the parents. It is the normal outcome when one language gets much less support than the others, and it can be changed.
Find the likely cause first
Before trying fixes, look at what has changed in your child's life. The table lists common causes, how they usually show up and the kind of response that tends to help.
| Likely cause | How it often shows up | Response that tends to help |
|---|---|---|
| Fewer hours in the home language since preschool started | Replies switched within a few months of starting school | Add protected daily routines and read-aloud time |
| Only one person speaks the language | Child speaks it to grandparents on visits but not to the parent at home | Add speakers: calls, playgroups, a caregiver |
| The parent often switches to English | Parent answers in English when tired or in a hurry | Parent agrees to stay in the home language with the child |
| Siblings use the school language together | Children play in English or Vietnamese | Give siblings shared home-language activities |
| The language feels like a test | Child goes quiet or refuses when asked to say words | Stop drilling; switch to recasting and play |
| Embarrassment in front of friends | Child refuses only when classmates are around | Respect it in public, keep the language strong at home |
Most families find two or three causes at once. Tackle the ones you can change most easily first, usually hours and the parent's own language habits, before working on harder ones such as sibling dynamics.
It helps to keep a simple note for two weeks of every time your child uses a home-language word or sentence, with whom and in what situation. Parents who do this often discover that the language is more alive than they feared, for instance during bath time or with a particular grandparent, and those moments show where to build first.
What tends to backfire
Refusing to respond until the child switches. Some parents pretend not to understand or ignore English replies. Occasional, light requests for the home language can work, but making every exchange conditional on language choice can make a child feel rejected and dig in harder.
Drilling words. Asking a child to say a word in the home language, or to repeat a sentence correctly, turns the language into a quiz. Children who feel tested often say less, not more.
Comparing with other children. Saying that a cousin speaks the language perfectly rarely motivates a preschooler. It mostly attaches shame to the language.
Long lectures about heritage. Explaining to a four-year-old why the language matters for their future does not change everyday behaviour. Children respond to experiences, not arguments.
Switching strategies every few weeks. Inconsistency signals that the home language is negotiable. A modest plan kept for months works better than a new rule every fortnight.
Blaming the school. A child's preschool is doing its job by building Vietnamese and English. Seeing it as the enemy of the home language rarely helps; adding support at home does.
A staged plan to bring the language back
This plan assumes one parent speaks the home language and the child is between three and six. Give each stage several weeks before moving on, and expect setbacks.
- Stage one, more input without pressure: increase the hours the child hears the home language through daily stories, songs, play and talk. Do not ask the child to speak it yet. The goal is to make the language feel enjoyable and familiar again.
- Stage two, the parent stays in the language: the home-language parent answers every time in the home language, warmly, including when the child speaks English. Recast what the child said in the home language and carry on with the conversation.
- Stage three, gentle invitations: occasionally ask clarifying questions in the home language, offer two choices in it, or pause as if waiting for a word. Praise any home-language words the child uses, mixed sentences included.
- Stage four, add other speakers: arrange regular contact with people who speak only, or mainly, the home language, such as grandparents on video, a caregiver or children from the same community. These are the situations where the child genuinely needs the language.
- Stage five, a period of immersion: a trip home, a visit from relatives or a holiday camp in the home language often produces a jump in speaking that is hard to achieve in Saigon alone.
- Stage six, keep the gains: when the child starts speaking again, keep the routines going. Languages that come back quickly can slide back just as quickly.
Parents often notice the first change in stage two or three: a single home-language word inside an English sentence, or an answer in the home language to a grandparent but not yet to the parent. Treat these as signs the plan is working, not as half-measures.
Trips home, visitors and immersion
Many families report that their child came back from a summer with grandparents speaking the home language far more confidently. There is a simple reason. For a few weeks the child is surrounded by people who use the language for everything, including other children, and English or Vietnamese stops working. The need to communicate becomes real, and the passive knowledge stored over months suddenly has a use.
The effect is often strongest when the child spends time away from the parent who speaks English, for example staying with grandparents while that parent is at work, or playing with cousins who speak little English. A child who has both parents nearby may continue switching to English with them. It can feel strange to plan a holiday around the idea that your child needs fewer familiar people, but even a few days of this can make a difference.
Visitors work in a similar way in reverse. When grandparents or relatives from the home country come to Saigon, giving them time alone with the child, at home or on outings, helps more than group activities in which everyone switches to a shared language. After an immersion period, the routines described above are what keep the language from fading again once school starts.
Three hypothetical families
The following situations are hypothetical examples, put together to show how different causes call for different responses. A Dutch mother and an American father noticed that their four-year-old answered the mother only in English within six months of starting preschool. The audit showed that the mother switched to English most evenings because the father did not understand Dutch. The fix was simple but required discipline: the mother kept to Dutch with the child, the father learned a few Dutch phrases, and Saturday breakfast became a Dutch meal for everyone.
In a second example, two siblings with a Korean mother and a Vietnamese father had started playing together in Vietnamese. Each child still spoke Korean to the mother, but less and less. The family introduced a Korean bedtime story that both children shared and found a weekend playgroup with other Korean-speaking children. Within a few months the siblings sometimes played games in Korean, though Vietnamese remained their main language together.
In a third example, a five-year-old with a Spanish-speaking father refused Spanish in public after a classmate laughed at him. At home he still spoke some Spanish. The father stopped insisting outside the house, kept speaking Spanish at home and arranged a video call each week with a cousin of the same age. The child's confidence returned after a summer visit to Spain. Each family had different causes, so each needed a different response.
When it is reasonable to adjust the goal
Sometimes a family does everything sensible and the home language still stays mostly passive. The parent who speaks it may travel constantly, there may be no other speakers in the city, or the family may be planning a long-term move to an English-speaking country. In these cases it can be healthy to reframe the goal. A child who understands the language well, can follow a conversation with grandparents and enjoys stories in it has a strong foundation that can be reactivated later.
Research on heritage speakers, people who grew up with a family language that became weaker than the majority language, shows that many of them can relearn and strengthen it as teenagers or adults, often faster than people starting from nothing. Passive knowledge is not wasted. Keeping the language warm and present, even at a lower level, preserves that option.
Adjusting the goal is not the same as giving up. It means choosing a sustainable level of effort and avoiding a cycle of pressure and resistance that damages the relationship between parent and child. The parent can keep speaking the language, keep the routines that the family enjoys, and stay open to a revival when circumstances change, such as a move, a new caregiver or a child's own curiosity a few years later.
Câu hỏi thường gặp
How long does it take for a child to start speaking a home language again?
It varies widely. Some children start using words again within a few weeks of increased input, while others need months or an immersion period such as a trip home. Progress is often uneven, with sudden jumps after a holiday or a visit from relatives, and slower phases during busy school terms.
Should the home-language parent stop speaking English to the child altogether?
It usually helps if that parent keeps to the home language with the child as consistently as possible, because a parent who switches easily signals that the language is optional. Using English with other people in the child's presence is fine. What matters is the language between that parent and the child.
Is it harmful to insist that my child answers in the home language?
Firm habits combined with warmth tend to work better than insistence. Occasional gentle requests are fine, but making every exchange depend on language choice can create resentment and make the child resist more. Recasting and creating real needs for the language are usually more effective.
My child speaks the home language to grandparents but not to me. Why?
Grandparents who do not understand English create a real need for the language, while a parent who understands English does not. This is a good sign that the language is still active. You can build on it by keeping to the home language yourself and adding more situations where English does not work.
Will a home-language weekend school solve the problem?
A weekend school or playgroup can help by adding speakers and showing that other children use the language. On its own, a few hours a week rarely reverses passive bilingualism. It works best combined with more home-language routines and a parent who stays in the language consistently.
Can a passive bilingual child become fluent later?
Yes, many do. People who grew up understanding a family language often relearn it more easily than complete beginners, especially with immersion or classes as teenagers or adults. Keeping the language present during childhood, even passively, preserves that foundation.