מזל טוב!

Traditionally, when a couple become engaged the mothers break a plate.

No daddy, I was just... Looking at it.

Okay I fell for it and made the mistake of "is the plate broken?"

Can't it be "Did you break the plate?", which would seem much more viable to say in normal language. It's not like usually there's a plate breaker, whose role is to do so (unless it is the mother after an engagement as NaftaliFri1 stated).