We pottered around the house until Tilly came back from her sleepover (very tired - I'm not sure that she slept much at all), then discovered that there's something wrong with Mum's camera, in that it's overexposing pretty much everything. I can make it better by setting things manually, but that's not really a solution for a point and shoot camera. She's taking my SX210 for the moment.
We drove to San Francisco (very slowly, the traffic was appalling) so I could go and do some work, and Mum and Dad can finish up their holiday in the city. Work, yay.