Hello Jan,
I've been looking at the Death family from Fordham and copied the Parish registers a few years ago, just for the Death family.
I believe Josiah's grandparents were John Death (died 1849 Fordham, age 84) and Mary (died 1847 Fordham, age 84). His parents were James Death ( died 1833 age 53, Fordham) and Hannah Wynburn (died 1813, age 33 Fordham). James later married Elizabeth Whisby in 1816 and had several more children.
I have three children from the first marriage (not in order) - Mary who married John Galley 1829, then John Wright in 1857
Also Diana who married James Moss in 1839. and Josiah.
Hope this is some help.
Ann