The Only One Facing As Much Pressure As the Pastor is ... The Pastor’s Kid Dad may be following God’s call, but the Pastor’s kids (PKs) are just following mom and dad. Often to devastating results. Barnabas Piper – son of Pastor and bestselling author John Piper – has experienced the challenges of being a PK first-hand. With empathy, humor, and personal stories, he addresses the pervasive assumptions, identity issues and accelerated scrutiny PKs face. But more than just stating the problems – he shares the one thing a PK needs above all else (as do their pastor/father and church) is to live in true freedom and wholeness.