You don't need two fluent speakers

Plenty of British families raise children in two languages with only one parent who speaks the additional language well. The classic "one parent, one language" approach is a useful starting point, but it is not the only route, and it is not a test you can fail. What matters far more than the number of fluent adults in the house is the amount and quality of time your child spends hearing and using the language — and the consistency with which your household treats it as something worth speaking.

If you are the fluent parent, you are the engine. If you are the English-speaking partner, you are not a bystander: your attitude towards the language shapes your child's more than almost anything else.

Agree a family language plan — then loosen it

Sit down together and decide, roughly, who speaks what to whom and when. Vague good intentions rarely survive a Tuesday evening.

• Choose domains rather than trying to cover everything. Some families use the minority language at breakfast, bathtime and bedtime. Others reserve whole days — Saturday is Danish day — or whole rooms, or the car.
• Name the monolingual parent's role. You might not speak the language, but you can be the one who remembers, prompts and praises: "Ask Mum in Spanish."
• Keep discipline out of it. If the minority language is only used for telling off and teeth-brushing, children learn to associate it with chores and conflict.
• Write it down, then revise it. Plans change when a child starts nursery, when a sibling arrives, when work shifts. That is normal, not failure.

Make it the language of joy, not of lessons

Children acquire language fastest when they are absorbed in something they actually want to do. Aim for hours rather than minutes, woven into ordinary life: cooking, pretending, arguing about whose turn it is on the swing.

• Read aloud every day, even when your child can read English perfectly well. Picture books, comics, non-fiction about diggers or dinosaurs — anything they will sit still for.
• Use audio: stories in the car, songs at bathtime, a playlist for the kitchen. Repetition is not boring to a four-year-old.
• Watch films and cartoons with the minority language soundtrack and English subtitles, or the other way round, as they get older.
• Resist the urge to turn every conversation into a quiz. Corrections should be gentle and mostly indirect — repeat the sentence back correctly rather than announcing the rule.

Build a village outside the front door

One parent, however dedicated, cannot supply a whole language on their own. Look for community.

• Supplementary or Saturday schools, often run by community associations, churches, mosques, temples or cultural centres. Quality varies, so visit before committing.
• Local meet-ups and playgroups for speakers of your language — even a monthly coffee morning counts.
• Short, frequent video calls with grandparents and cousins. Ten minutes twice a week beats an hour once a month.
• Your local library can often order books in other languages, and university language departments sometimes run children's events or conversation groups.
• Holidays and visits, when you can manage them, do more for motivation than months of home practice.

When they answer you in English

They will. This is the single most common source of worry for bilingual families, and it is usually a phase rather than a verdict.

Try recasting: they say "I want the blue one", you reply in your language, "Here's the blue one — the blue one, yes?" You keep the conversation going and they hear the model again. Refusing to respond to English at all tends to produce stand-offs; accepting it while continuing to speak your own language tends to work better. Expect a silent period, expect a plateau around school entry when English becomes the language of friendship, and expect a possible refusal in the teenage years. Many children come back to it later, often with real enthusiasm.

Siblings, meanwhile, will usually default to English with each other. Don't police it. Instead, protect a little one-to-one time with each child in the minority language, where there is no English-speaking sibling to fall back on.

Play the long game

Your child's two languages will not develop evenly, and that is fine. Receptive understanding often runs well ahead of speaking. If you want a goal to aim at, formal qualifications — a GCSE, an A-level, or a community language certificate — can give teenagers a reason to keep going when motivation dips.

If you are the English-speaking parent, learn a little yourself: greetings, thank-yous, a few family phrases. It signals to your child that the language belongs to the whole household, not just to one adult. And be kind to yourself about the gaps. Bilingualism in a monolingual country is built out of ordinary, imperfect, repeated days — not perfect ones.