This profile lists the date of marriage of George to Esther Pacey as June 10, 1862, but there is evidence that her maiden name was then written as Peacey, and that they married on April 20, 1863. See the Sources tab.
Also, the Sydney Morning Herald of 1863-04-22 contains an announcement of the marriage of George Pratt and Esther Peacey on April 20th. Two other newspapers list the same item.
So I'll change these details in the profiles of George and Esther to match.