This was the marriage that I saw on IGI for John Cloy:
John CLOY and Jane BROADFOOT Marriage on 4 August 1842 in Old Luce
The children that Adrian mentioned for John and Jane look to be staying with her parents in 1851.
William's marriage to Jessie, again from IGI, is I think this one:
William CLOY and Jess DAVIDSON Marriage on 22 December 1853 in Old Luce.
All entries from the OPRs, so information on the parish register likely to be minimal.
Monica

PS: Where does Australia come in? Did William Cloy die there?