Harry has recently moved to London, and on a free weekend, John pops over to her flat for dinner. Mum is there too, and the two women are having a good laugh when he walks in. (It's good to hear them happy. I knew Mum would come around sooner or later.) They seem a bit more cheerful than usual, but he chalks it up to the beautiful weather and the fact that they don't see each other often.
Mum asks John how his studies are going, and he says quite well. She makes an off-colour joke about dissecting cadavers. Harry laughs uproariously; John blushes. That's when he notices how the two them are holding their glasses. (Don't say anything. You don't have proof yet.)
After dinner, John offers to clean up while Mum and Harry relax. Once they're out of the room, he peeks into the rubbish bin and finds that it's full of empty liquor bottles.
John's greatest fear is that his childhood is about to repeat itself.