Re: Michael McChrystal.
Here's a family with all the right names in the 1871 England Census:
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Charnock Heath, Lancashire
McCrystal, Michael, Head, married, aged 51, laborer, waterworks, born Ireland
McCrystal, Susan, Wife, married, aged 45, born Ireland
McCrystal, Michael, Son, aged 14, laborer, water works, born Ireland
McCrystal, Arthur, Son, aged 12, laborer, water works, born Ireland
McCrystal, John, Son, aged 10, scholar, born Ireland
Wonder if you've got two different families mixed up?
Arthur's wife, Ellen, from the 1911 census seems to have been born in Desertmartin, Co. Londonderry.