Peter is the son of John. John is the father of Peter. Therefore, John is the _______ of Peter’s father. Ah! Click here to read the solution. Name. Share Brain TeaserFacebookGoogle+TwitterPinterestLinkedIn Related Brain Teaser:The Cassette RecorderJanuary 18, 2018Crack The CodeJanuary 18, 2018The Crime SceneJanuary 18, 2018The ShooterJanuary 18, 2018