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Ooooooh that makes sense!!
He's been acting very strange about his own family - I saw him superimposing a couple of girls (I think) into a photo of just him, and then made out that they were his sisters. And yep, a while back there was that episode when Myra was talking to her mum about having been made to give up a child when she was young.
Is Niall meant to be older than Jacquie then do you think? I guess he could be - I can't quite work out how old Carmel/Mercedes/KJacquie are all meant to be...