Raising bilingual Thai kids abroad: what helps at home

You promised yourself the baby would grow up with Thai. Then nursery started, English took over the house, and now your three-year-old understands every word Yai says and answers her in English. If that’s where you are, you’re in very good company. Nothing is lost, and there’s a lot you can still do.

What actually keeps Thai alive in a family abroad?

Hearing Thai often, from real people, with a reason to use it. That’s the short version of what researchers keep finding.

François Grosjean, an emeritus professor of psycholinguistics who has written about bilingual families for decades, puts it plainly: “children need the presence of a live person interacting with them to acquire a language.” He also points to need. If children feel they really need a language, they tend to develop it. A grandparent who only speaks Thai creates that need in the nicest possible way.

Status matters too. As Education Week summarised Grosjean’s view, peer pressure can push bilingual children to drop the home language. English at school will always feel big. Your job isn’t to beat it, just to make Thai feel warm, useful and normal at home.

Does one parent, one language work for Thai?

It helps, but less than its reputation suggests. In 2007, Annick De Houwer published a questionnaire study of close to 2,000 families in Flanders, Belgium, where at least one parent spoke a language other than Dutch at home. As Grosjean summarises it:

The study wasn’t about Thai, but the pattern is about how much input a child gets.

Grosjean’s own comment on one parent, one language: “contrary to general belief, it only produced a 74% success rate.” That’s still most children. The takeaway isn’t that your system is wrong. It’s that the amount of Thai at home matters more than the rule you give it.

So, in practice:

• If both parents speak Thai, keeping Thai as the home language gives it the most room. The local language usually arrives anyway through school and friends.
• If one parent speaks Thai, that parent speaking Thai consistently is a strong base. Thai from other people (Yai, aunties, family friends, Thai playdates) fills in what one voice can’t.
• If the Thai-speaking parent switches a lot, that’s human, not a failure. Look for daily spots where Thai can be the default, like meals, bath and bedtime.

What does “harmonious bilingualism” mean?

It’s De Houwer’s term for how families with young children fare when they live with two languages. Her 2015 paper frames it as young families’ well-being in language contact situations, and HaBilNet, the research network she leads, describes it as “well-being specifically in a bilingual setting.”

That reframes the goal. A family where the kid answers mostly in English but Yai feels connected and dinner is calm has a good base to build on. One where Thai has become a nightly fight probably needs less pressure, not more. HaBilNet also quotes De Houwer: “A bilingual upbringing is never a reason for a slow language development.”

Which everyday habits give kids the most Thai?

Small, repeated, real moments. Thai doesn’t need a lesson slot. It fits into the edges of the day you already have.

Meals. Thai family life happens around food, and the call to the table is the same every day, which is exactly how little ones learn:

กินข้าวกันลูก

gin khaao gan luuk

Draft: waiting for a native speaker’s review.

Bedtime. The last words of the day stick. A Thai goodnight is a tiny habit that can last for years:

ฝันดีนะลูก

fan dii na luuk

Draft: waiting for a native speaker’s review.

Songs and rhymes. The Communication Health Support Association, whose guidance is powered by the expertise of the American Speech-Language-Hearing Association (ASHA), calls songs “a fun way to introduce and practice language”, and suggests reading picture books together in your languages. Thai lullabies like จันทร์เอ๋ยจันทร์เจ้า (jan oei jan jao, “Moon, oh dear moon”), sung or chanted at bedtime, are an easy start. Every family sings it a little differently, so ask Yai how hers did.

Cartoons and shows. Screens are a bonus, not a replacement for people, since the research keeps pointing to live interaction. But watching a Thai cartoon together and talking about it counts. If you want ideas from your own childhood, see what we grew up with.

Video calls with grandparents. This is where the “need” is most real. A regular call with Yai, with a few set phrases your child can always say, is some of the best Thai practice there is. Our guide to a video call with Yai has the phrases.

Trips to Thailand. Suddenly Thai is the language of cousins, the 7-Eleven and the beach. Thai stops being a home-only language and starts being useful, which is exactly the need Grosjean describes. Don’t promise them (or yourself) fluency, just let the trip be fun.

Saturday Thai school. Whether a weekend Thai class is worth it for your family is a decision of its own. We gave it a full, honest look in should my kid go to Thai school? Short version: it works best on top of Thai at home, not instead of it.

My toddler answers in English. What should I do?

Keep going, gently. It’s one of the most common patterns in bilingual families, and it doesn’t mean your child is rejecting Thai. English is simply the easiest language for them to reach for.

Researchers have looked closely at how parents respond in these moments. Elizabeth Lanza’s work, revisited by De Houwer and Janice Nakamura in 2021, showed that parents can shape two-year-olds’ language choices through the way they respond. The same review adds that “not only do parents affect their children, but children also affect their parents”. So if you’ve drifted into English with your kid, that’s a two-way street, not a parenting fail.

Responses that keep Thai going without pressure:

1. Answer in Thai anyway. You understood them, they understood you, and the conversation carries on in Thai.
2. Repeat their answer back in Thai, like a friendly echo, not a correction. They hear the Thai words for what they just said.
3. Make the reply tiny. One word in Thai is a win. Praise the attempt, never the grammar.
4. Skip the “say it in Thai or no snack” deals. They tend to turn Thai into a test, and harmony matters more than any one sentence.

And when they do say something in Thai, however small, cheer it:

เก่งมากลูก

geng maak luuk

Draft: waiting for a native speaker’s review.

Will mixing Thai and English confuse my child?

No. The same CHSA guidance says “Using multiple languages does not confuse children or cause speech or language delays”, and that children sometimes blend words or grammar rules from different languages as a normal part of learning. A sentence that’s half Thai, half English is a bilingual brain at work. No need to correct it. Enjoy it, and keep offering the Thai.

The one time to check with a professional is if a child is behind in both languages. HaBilNet’s advice is to see someone if a child says no words at all by about 18 months, or isn’t putting words together soon after two, and it notes that being bilingual is not the cause.

My Thai isn’t great. Can I still pass it on?

Yes. If you grew up understanding more Thai than you speak, you might wonder if your Thai is “good enough” to give your kids. It is. Whatever you have is more than nothing, and your child doesn’t need perfect Thai from you. They need Thai from someone who loves them.

The same CHSA guidance suggests talking to your child in the language or languages you’re most comfortable with, so don’t force long Thai conversations that feel fake. Use the Thai you’re sure of (food, praise, bedtime, family words) and let English carry the rest. Then bring in people whose Thai is stronger. Grosjean notes that extended family and friends who speak the child’s languages are valuable, most of all for the weaker one. Your Thai plus Yai’s on video calls is a real team.

Your attitude counts as much as your vocabulary. Grosjean writes that “Children are extremely receptive to the linguistic attitudes of their parents, teachers and peers”. If you’re visibly happy to use your bits of Thai, and laugh at your own mistakes, your kids learn that Thai is a warm thing, not a scary one. And if you want to grow your own Thai alongside theirs, start with learning Thai to talk to your family.

Where to start this week

Pick one moment: dinner, bath or bedtime. Say the same Thai line there every day. Add one call with Yai. That’s it. Next month, add another moment.

That’s what the Thai with my kids moment in Reply Thai is built for: short Thai lines for mealtimes, bath, bedtime, praise and songs, practised as things you actually say to your little one, so the Thai is ready when the moment comes.

Reply Thai for iPhoneComing soon

Thai words on this page are a draft until a native speaker has reviewed them.