Mary felt sure that the ticket-bot would know who she really was, but when they boarded the automatic tram, it simply said
Grandma and Mary exchanged glances and then nervously looked at George, who was clearing cups and saucers away. He had stopped momentarily and was giving them all an odd look. He made a noise that sounded like he was clearing his throat, if he had actually had one, that is. He spoke in a disapproving tone.