They are matter of fact about it. They know which chair you sit in and which days are worse, and read your face from the doorway. They worked it out, the way children do, by watching.

Underneath the gratitude is the fear. That this is what they will carry, that you are handing them a childhood spent managing an adult.

If there are no children in your house, there may be a niece, a grandchild or a neighbour’s child who notices more than you think.

So, what is known and what is not.

Children notice. Protecting them by saying nothing does not work, because a child who is not told does not stop wondering. They fill the gap themselves, with something often worse than the truth, and often involving them. You are tired because of me. You were fine before I was born.

What helps is not pretending. It is explanation, repeated, pitched to their age. The condition has a name. Say only what is true: if it is not catching, say so, and if it can run in families, ask your doctor how to answer ‘will I get it?’ Bad days are the illness, not anything they did. Children do better with difficulty that is named than difficulty left unexplained.

Now the part that is not romantic. There is a version of this letter that says your illness is secretly a gift. Partly true: children who grow up alongside illness often read people well. But a child managing medicines or worrying through the night is carrying something they should not carry. A child who is withdrawn, not sleeping or struggling at school may be, too. That is not a silver lining. It is a signal the household needs more help.

If any of that is happening, say so to your doctor or the school. Support for young carers is badly advertised. In England a young carer can ask the council for an assessment, and the other UK nations have their own routes. Asking is not an admission of failure. It is the same as asking for a ramp.

And if the guilt ever gets heavy enough that you think they would be better off without you, tell somebody today. Your doctor, or Samaritans on 116 123 in the UK, 988 in the US. If you are in immediate danger, call 999 (911 in the US).

What they are learning, in the ordinary case, is not what you fear. That a person can be unwell and still be entirely themselves. That help can be asked for out loud. That love does not require anyone to be well.

They are learning something you cannot see from inside it. They are watching somebody live with a hard thing, resting when they have to and carrying on when they can. That registers, even if nobody mentions it for twenty years.

I cannot promise they will be unmarked. Nobody can promise that about any childhood. What is true is that the symptom is rarely what stays. What stays is often the atmosphere around it.

Come Home

Five lines, for anyone a child watches.

One act for today, or smaller still. Say thank you, in words, for one small thing a child, or anyone else who has looked out for you, has done. Or, if you are ready, one true thing about your condition, nothing frightening, pitched to their age. Your clinic or a charity may have something written for children.

They will not remember you as the illness. They will remember the room, whether it was honest and whether they were let in.

P.S. On Monday, a question worth a week. What have you been putting off until you are better, and what has that cost already?