My Kid Speaks English at School and Our Language at Home — and That's the Point

In short

• Australia has over 300 languages spoken at home, but heritage language loss typically begins by age 7–8 once English schooling takes hold.
• Research by Ellen Bialystok shows bilingual children consistently demonstrate stronger executive function — better attention, faster task-switching, greater cognitive flexibility.
• Jim Cummins' interdependence hypothesis shows strong first-language literacy actually supports second-language acquisition — it does not compete with it.
• One-parent-one-language at home, paired with community exposure (Saturday schools, grandparents, media), is the most effective maintenance strategy.
• Speaking your language at home is not confusing for your child. It is a gift.

The week a family moves from Sydney to a regional town, something shifts. The grandmother visits less. Mandarin, or Arabic, or Hindi, slips from the dinner table. Within six months the child is answering in English even when addressed in the home language. By Year 2, the heritage language is mostly gone.

This pattern happens quietly and quickly, in families across Australia, across every community language. The parents didn't decide to let it happen. They were busy. English was everywhere. The child seemed fine.

Australia is one of the most linguistically diverse countries on earth. According to the ABS 2021 Census, more than 300 languages are spoken in Australian homes, and roughly 22% of Australians speak a language other than English at home. Mandarin, Arabic, Vietnamese, Cantonese, Punjabi, Hindi, Greek, Italian — these aren't minority outliers. In many suburbs of Melbourne, Sydney, and Brisbane, they're the dominant home languages on whole streets. And yet, heritage language loss — the gradual erosion of a family language across generations — is the norm, not the exception.

Linguists call it language shift. Parents just call it losing something.

Why the early years are the window that matters

Ellen Bialystok, a cognitive psychologist at York University in Toronto, has spent decades studying bilingual children. Her 2004 and 2011 work found consistent executive function advantages in bilingual children compared to monolingual peers — specifically in attention control, cognitive flexibility, and the ability to switch between tasks. The bilingual advantage, she argues, comes from the constant practice of managing two language systems simultaneously: suppressing one while activating the other. That mental workout, repeated thousands of times a day, strengthens attentional networks.

This isn't a modest effect. In a 2004 study with children aged five to nine, Bialystok found that bilingual children significantly outperformed monolingual children on tasks requiring them to ignore misleading information and focus on relevant cues. The effect was particularly strong in children who used both languages regularly and actively.

The crucial variable is "regularly and actively." A child who once spoke Greek but now only uses English at home isn't getting the cognitive workout. The advantages come from genuine, sustained bilingualism — which is exactly what fades when home language maintenance slips.

The myth that won't die

Parents who speak a language other than English at home are still routinely told — by well-meaning friends, by people at the playground — that speaking two languages will confuse their child. That they should pick one. That the child will fall behind in school.

None of this is supported by the evidence, and hasn't been for decades.

Jim Cummins, a researcher at the University of Toronto, proposed the interdependence hypothesis back in 1979. The core idea: literacy and academic skills developed in a first language transfer to a second language. Strong L1 supports strong L2. A child with a rich, developed Cantonese vocabulary is not starting English from scratch — they have the underlying concepts, the narrative structures, the metalinguistic awareness. The languages share a cognitive foundation.

This has been replicated extensively. Tatiana Kellaghan, Mela Sarkar, Barbara Pearson — the evidence base is large and consistent. Bilingualism doesn't create cognitive overload. It creates cognitive flexibility. The confusion story persists not because of data, but because parents are worried and a simple answer feels reassuring.

What actually happens after the school gates open

Most families experience a version of the same story. The child starts kindy or prep. English floods in. Within weeks or months, the child starts defaulting to English at home, even when a parent addresses them in the home language. Parents, often unconsciously, start accommodating. They answer in English because it's easier. The child's English accelerates; the home language starts to plateau.

Research by Annick De Houwer (2007) on bilingual family communication patterns found that consistent input in a minority home language is the single strongest predictor of whether a child maintains it. The "one-parent-one-language" approach — each parent commits to one language, consistently — is the most widely studied maintenance strategy, and the evidence for it is solid. It works not because of some magic structure, but because it creates predictable, sustained exposure.

What makes it hard is that it can feel unnatural to maintain a language the child isn't keen on using. A parent speaks Vietnamese; the child answers in English; the parent continues in Vietnamese. It requires a kind of cheerful stubbornness.

The Saturday school question

Across Australia's major cities, Saturday language schools are a quietly enormous institution. Community-run programs in Chinese (Mandarin and Cantonese), Arabic, Greek, Italian, Hindi, Vietnamese, and dozens of other languages operate out of local halls and community centres every weekend. They're often run by volunteer teachers, sustained by parent committees, funded on a shoestring.

Research by Terry Wiley and Wendy Wang on heritage language schooling in multicultural communities points to community exposure as one of the strongest protective factors against language shift — not because of what happens in the classroom alone, but because of the social signal it sends to the child. The language is real. Other people speak it. It matters outside our house.

For children in the middle primary years — roughly Year 2 through Year 5 — Saturday schools often provide what home alone cannot: peers. A child who learns that their language is spoken by kids their own age, not just grandparents, has a different relationship to it.

The September school holidays are a natural point to investigate what's available. Most Saturday programs run in term time and have enrolment rounds in Term 4. If you've been thinking about it, now is a reasonable time to look.

The grandparent variable

If there are grandparents — in person, or on a screen — they are often the most powerful heritage language resource a family has. Not because grandparents set out to teach language, but because they often can't not teach it. Many older family members speak limited English, or feel most themselves in the home language. The relationship with a grandchild is conducted through that language, and children, who want to know their grandparents, learn.

Research by Terry Au and Leah Romo (1997) on heritage language acquisition found that even partial earlier exposure — particularly through emotionally significant relationships — significantly eased later reacquisition when adult heritage language learners attempted to re-engage. The phonological patterns laid down in early childhood don't disappear. They go quiet.

This means even imperfect, limited, grandparent-mediated transmission has long-term value. The FaceTime call where Ba Ngoai tells the same story every week. The weekend visit where nonno insists on using Italian even when everyone else has switched. These moments are more than sentiment. They are language maintenance, and they work.

The literacy piece

One thing parents often don't anticipate: the home language needs reading and writing too, not just speaking. A child who speaks Punjabi fluently but cannot read Gurmukhi script is in a different position from one who has some literacy in the language. Jim Cummins' interdependence hypothesis applies here — the academic language skills that transfer between languages are built on literacy, not just conversation.

This is where Saturday schools earn their keep. A child who learns to read and write even basic Arabic or Greek or Mandarin has unlocked a different level of access to that language — to literature, to family communication, to media, to cultural participation. It changes the relationship from "a language I speak at home" to "a language I can use."

For families where Saturday school isn't an option, there are other paths. Mother Tongue, Duolingo (better for some languages than others), community library programs, heritage language picture books brought home from visits overseas, or sourced online. Literacy in L1 doesn't have to be formal to matter.

What you're giving them

It's easy to frame heritage language maintenance as an effort parents make for their children's sake. That's true. It's also incomplete.

The languages in your home are part of who you are. They carry history, relationship, meaning that doesn't fully translate. A parent who speaks to their child in the family language is not just teaching vocabulary. They are passing down something about where the family comes from, how they see the world, what they value.

Ellen Bialystok puts it plainly: bilingualism is a life skill with cognitive benefits, cultural benefits, and social benefits. It opens doors — in employment, in relationships, in access to communities — that a monolingual child simply cannot walk through.

You don't have to be perfect. You don't have to run a structured program at home. You don't have to spend money on classes. You just have to keep using the language. Speak it at the dinner table. Play music in it. Read a picture book. Call the grandparents. Let it be ordinary.

Your child will figure out English. The school guarantees that. The home language, though — that one is up to you. There will be stretches where it feels like a lot of effort for unclear returns, where the child answers in English no matter what you do, where you wonder whether it's worth maintaining. It usually is. The research is fairly clear on that, even when the daily reality isn't.