Which statement from the passage supports the conclusion that Mr. Keller had been previously married?
Doctor: Ive never seen a baby with more vitality, that's the truth.
Keller: Ive brought up two of them, but this is my wife's first, she isn't battle-scarred yet.
Kate: I don't see what's so cute about a congestion just because it's yours.
Doctor: You're a pair of lucky parents.