Hi,
according to the SFHG baptisms you Amelia baptised 11/05/1806
Olivia bapt 018/12/1808
Perry bapt 31/03/1811
Frances Caroline bapt 18/07/1813 for this child it says John is Husbandman and the abode isTP I am sorry I don't know what TP means
I also found Thomas bapt 25/06/1815 but this has John as a Fisherman and living in Gardeners Street.
They all have John and Mary as the Parents
I looked up the marriage index but couldn't find a marriage for John to a Mary that fits with the timeline.
Might give you something to work woth.