Just as Chloe Harris and Mackenzie Boyd get things back on track, Emmerdale fans think they have worked out a new twist.The young couple share baby Reuben together after a one-night stand that ended up splitting Mack and his wife Charity up. But fans of the show are suspecting that Mack isn't the biological father of the little one.The theory comes after Mackenzie spent two nights in the cells after he was accused of the attempted murder of Caleb Milligan.