You are very optimistic trying to get back to the 1600's with the Owen line.
I have been doing this for years and was happy to get back to mid 1750's with my Family lines. This has been properly researched with B/M/D Certs purcased, Parish Records, Wills etc.
With such a common name Owen it will be very hard and I havent found anything for John/Mary Owen yet other than Henrys Baptism.
Sarah line is a lot easier;
1841 Census in Liverpool we have;
Sarah NORCOTT, 45, Widow
Martha, 15, Spinster
SARAH, 20, Spinster***
John, 15, Son
Mary, 8, Daug
William, 5, Son
So John is either not at Home or has died between 1835-1841
Possible Marriage;
Sarah EATON/John NORCOTT
Marriage Date: 14 Apr 1816
Marriage Place: Liverpool, Lancashire
Not LancsOPC has her as CATON
Trish

So John is either not at Home or has died between 1835-1841