 Paul's son, Ross Moriarty, is also a professional rugby union player.A second row or back row forward, Moriarty played rugby union for Swansea RFC, and was in the Wales squad for the 1987 Rugby World Cup, helping Wales to third place and scoring a try in the 22–21 third place play-off victory over Australia.Moriarty changed rugby football codes from rugby union to rugby league when he transferred to champions Widnes.