Pat
I haven't seen this son of Isaac and Elizabeth on your Ancestry Tree- Phillip Emanuel Jacobs baptism Nov 1837 age 1 month. They are living at Kingswood Hill Parish of Bitton and County of Gloucester.
Note the Parish name of Bitton and that is the surname of Bitton one of the witnesses at the wedding of Isaac and Elizabeth.
Does the middle name Emanuel give a further clue to Isaac Abraham and his roots but Emanuel is also a common name.