Help! 2 Marriages, same people, different years

Good morning everyone,

I am banging my head here trying to figure this out so I'll try to explain it as best I can.

I have my GGG Grandmother b1822 coming to Australia 1841 She married David Morgan 1842. The have 7 Children between 1843 and 1854, one of whom (Catherine) died in 1855. In 1866 Catherine gives permission for her daughter Elizabeth to marry James Fisher aged 14. Catherine signs as WILSON but Elizabeths father is listed as David Morgan. So one buttumes he has died and Catherine remarries to a Wilson. I've obtained 2 certificates for the Wilson Munger marriage, the first is 1861 which explains why she signs as a WILSON at Elizabeths wedding & another in 1867. It's the definately the same couple. However the age for James Wilson on the second cert. dont match (no biggie) but Catherine on the first certificate has 2 children living and 2 dead and on the second she has 7 living and 2 dead. Also on the first cert. Catherine lists being a widow as of 1857 and one the second shes lists she's a widow as of Oct 1866. This date matches with the date of David Morgans rest in October 1866. I'm as yet still trying to locate a rest for Catherine.

I've uploaded the certifcates and they can be found at the link below. I'd be interested to see what others think.

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Melissa Young