My partner got his stage 4 diagnosis 2 years ago when one of our kids was 8 and the other 5. What I've found is that comprehension isn't immediate. Not for us, but especially not for them. There's what the disease is and what the disease will do and the fact we don't know when. We've skirted the details as we don't know how it will play out but over the last couple of years our kids have come to us with questions when they're ready. I think the TV dramatisations of conveying this kind of information doesn't prepare you for the fact that a lot of people, not just kids, take a few tellings for it to sink in.

I'm sorry you're in this position x

My wife’s mother was terminally ill and my wife said that she left a small box for her, with letters for milestones, telling her what had happened, and ways to stay happy. If this works for you, try it!