House Sitter Lost Our Key

Leo & Rebecca In The Morning...BUZZ QUESTION...Me and my wife left my buddy to House Sit while we were gone for a week. He lost or misplaced the key and NOW my wife is trippin. She wants me to CHANGE ALL THE LOCKS IN THE HOUSE. She also threw out that she thinks he's lying and keeping a key. I told her it's ridiculous to change all the locks, it will show up. WHO'S IN THE RIGHT HERE, ME OR HER???