Note, this is why my father didn’t speak with me for a few days – I actually said it during lunch time. Here’s how it went.
Father: Your grandpa’s birthday is today, did you send your regards?
Sister: Oh, yes.
Sister: Anyway, what birthday is this he’s celebrating?
Me: His last.
Mother bursts out laughing whilst simultaneously launching whatever she was chewing into my sister’s plate; my father, on the other hand, gave me a death stare.