Dr. Norman Korman: Joanna, what motivated you to rise and get the serving tray?
Annie: I thought you might be hungry.
Dr. Norman Korman: That's excellent, excellent.
Grant Stayton: What's excellent about it?
Dr. Norman Korman: I was hungry.
Joanna Stayton/Annie Proffitt: Try to understand, Grant, I don't love you anymore.
Grant Stayton: What's love got to do with marriage?
Joanna Stayton/Annie Proffitt: I just... ate a bug.
Answer: This is just speculation, but since he knew what hospital she'd been in, he likely went there and asked who'd claimed her and where they lived. It wouldn't be too difficult.