Planning Fail Redux

So the whole point of going to visit my folks at the end of the month was to overlap my sister being off-work due to half-term. And I've delayed sorting out Planning Fail until I could speak to her in order to figure out if there is anything we definitely need to do together when I'm up.

Only for her to turn around today and tell me "when I was giving you a hard time about not having bought your train ticket yet, I was talking about Christmas. I'd completely forgotten you saying you were coming at half-term."

*headdesk*