It’s starting to get dark, and I cross the living room to draw the curtains. She watches me from an armchair. “I’m glad you’re feeling better this evening”, I say.

“What do you mean, ‘feeling better’?”

I grin. “Well, you spent most of the day saying you hated this house and were going to sell up and move to a care home.”

She stares at me, outraged. “Really? I’ve never said that in my life!”

“You said it this afternoon.”

“Oh, I probably just said it to annoy you.”

I can’t help laughing to myself. “Honestly, one of these days someone should write us all into a sitcom”.

“What? I can’t hear you!”

“I was just saying it was funny that you said you said you wanted to be in a care home just to annoy me.”

“When did I say that?”

“Just now.”

“Really?” She settles back into the cushions. “Oh well. I probably said it just to annoy you.”

Alzheimer’s is a frightening, helpless disease to have, and sad and exhausting for carers. But sometimes, at the same time, it’s priceless.