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We finish the series with the grandmother of the family, Queenie.
We learn of her past in flashbacks.
When young she was determined to marry Patrick Mahon even though there was enmity between her and his sister Nora, but a family accident meant he ended up going into the church.
But before that Queenie and Patrick were together for a very short time and she has a deep, dark secret that if she reveals could cause a rift in the family now.