Thanks for replying, ladymacabethadmunsen. That's true.

Good point, thanks. Hopefully this particular argument won't happen again - it was about whose turn it was to do the washing-up (we take turns to do it each Sunday), and I made a rota so now it should be clear. My sister sometimes uses the fact that I have a poor memory to not believe me when I said who did it last, but hopefully she will believe me if I write it down!

I do understand, although like I said it took until I wrote it down for me to realise.