Would That Make Her My Daughter-in-Law?

I never know what to expect when N confronts me with a puzzled look on his face. Here's a recent example.

N:  Daddy, what does "engaged" mean?

Me:  It means you have promised to marry someone.

N:  Oh, so if I said I was going to marry Grandma Flo, it means I'm engaged to her?

Me:  Ummmm...  It means you've asked her to marry you and she has said "yes."

N:  Oh, in that case, Dad, I'm not engaged to Grandma Flo.

Me:  Thank you for clarifying.