If you were late, say so. Before they say it for you.
Every weak point in your case exists whether or not you mention it. The only variable is who says it first, and that changes what it is.
- Admitted by you, it's a fact with context.
- Discovered by them, it's a concealment.
Same event. Completely different weight.
What it buys you
Someone who volunteers something against their own interest becomes far more believable on everything else.
Nobody is assessing whether you're a perfect parent. They're assessing whether you're an accurate narrator. Those are very different tests.
State it, say what changed, stop
On 4 March I was forty minutes late and didn't message ahead. That was my fault. I now set a reminder and send a message if I'm running behind.
That's the whole thing.
Two ways to get it wrong
Collapsing. "I'm a terrible father, I've let them down." It's as damaging as denial: it asks the reader to reassure you, and suggests someone who won't hold steady under questioning.
Over-explaining. One sentence of context is fine. Three paragraphs is a defence, and a defence reads as something that needed defending.
Where the line is
This is for small, human, checkable things: being late, a short-tempered message, a missed call.
Anything touching a disputed allegation or a safeguarding question is not a "just be honest" decision. It goes to your lawyer first. If you're not sure which category something is in, that uncertainty is your answer: ask before you write.
General information, not legal advice. Court process differs between countries and regions; check anything that matters to your case with a qualified lawyer where you live.
This comes from Chapter 22 of the workbook, on owning what's yours in a written statement: how to write it, where it goes, and where the line is. Worksheet H is where you find these points in the first place.
See the workbook & spreadsheet