Jason reveals that a DNA test has finally shown the identity of the father of Katy's baby. Will this news build a bridge of forgiveness or tear Katy, Dee and their relationships apart? Pádraig grows suspicious of David's odd behaviour, clocking his white lies and distance from Gráinne. He wonders if David could be having an affair, or an open relationship, but it seems he's off the mark! Mo tries to explain Tadhg's character to his little girl Áine, who is livid with Tadhg's sinful behaviour at Máire's mass. Will Mo convince Áine to give her father a second chance?