Energetic, competitive, body-contact play (rough and tumble play (RTP)) is commonly observed among young children and is reported as an important feature of father-child relationships. Animal studies have demonstrated positive developmental effects of peer-peer play-wrestling, influencing cognitive and social outcomes. The purpose of this paper is to discuss the nature of RTP between father and child and its relationship to child development and to describe a theoretically informed measure of the quality of father-child RTP. (Contains 3 tables and 1 note.)