Let’s parse that shall we?
Why the original language?
Apart from his school motto, probably it was the only Latin he knew.
Sorry, don’t know.
Why a monkey?
Not a clue
And a clock, not a watch?
See above
Finally: the mother. Dad’s mother. She of the bridge games, snooty friends and distracted air.
Aha. A clue?
Perhaps.
Tempus fugit indeed.
However, tempus fugit, non autem memoria.
Well, not for dad.
Gratias pater.