Clever of you to find Elizabeth's death, emeltom (assuming it is her).
As far as I knew, she was married in Bathwick on 19 Apr. 1830 to William Hammond Haddock, landscape painter. At least, I was told that was his occupation, but I haven't found confirmation anywhere. He was buried at St Swithin, Walcot, on 6 June 1839, and I wonder why his wife would have been buried elsewhere -- different addresses given, as well as a different spelling for the surname, so there's still doubt, I feel.
I think Joseph born in December 1779, so was 87 when he died, but it was common enough to state age next birthday or "in his 88th year".