You've lost me Sandra, just because Israel died in Midsomer it doesn't mean that Ann hadn't moved to East Pennard. Of this parish just means it is where the people are living not where they are born.
I see it was with parental consent, that maybe points to Dad not being there.
It sounds very much to me that you have found the right family.
I wonder if they took the children back to where her Parents lived for Baptism, I'll give it a go.