Now I am not so sure about the first Sylvester...as my chart clearly shows Sylvester Corris m Margaret ?. So it looks like Margaret Kneale is the more likely one. Sylvester's parents look to be be Margaret Quirk and William Shimmin. Margaret Quirk being the daughter of William Quirk and Margaret Quine. In brackets at the side of Margaret Quine's name is (Kirk Christ Lezayre)
This means the Elizabeth you have(30.11.1839) would be William Corris' (my ggg, who married Margaret Jones in Liverpool) sister. I do hope you can find more on this line for me, and I appreciate the leads you have provided so far.
It would help if they didn't all have the same names!
Thanks,
Lynn