I could describe Jekyll. That would be fun. The conversation would go, essentially:
Nana: Have you got a boyfriend yet?
Me: Yep! He's the sweetest, cutest guy ever, but every now and then he turns into this tiny, creepy, homicidal rapist with ugly sideburns.
Nana: O_O You shouldn't go out with that kind of boy...! *pause* Hmm, these flowers need watering. Do you have a boyfriend yet, Kay?
Me: You do know that Kay is my Mum, right?
Nana: Ooh, that's right, she is! You look more like her every time I see you! Are you dating?