In 1803 John Prideaux was co-executor of his father's will.
In 1824 John Prideaux was a witness at the marriage of his niece Honor Prideaux Vivian to Joseph Harris.
In 1826 John Prideaux and his brother Henry were appointed executors of the will of their sister Prudence Prideaux. Both brothers later renounced, their sister Mary Michell granted Administration.
In 1833 John Prideaux was a witness at the marriage of his niece Prudence Vivian to William Berriman.
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In 1841 John Prideaux (55), messenger, was living in Hayle Phillack. Present was Eliza Williams, F. S. [farm servant]
In 1851 John Prideaux (72) of Phillack, widower, late steam packets agent, was living in Penpull Terrace, Phillack. Present was [great] niece Mary Simons (31) of Phillack, house keeper
In 1861 John Prideaux (82) of Phillack, widower, retired clerk, was living in Penpol Terrace, Phillack.
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John Prideaux of Hayle Terrace died aged 86 years (burial record).
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The Will of John Prideaux other Pridiaux late of the parish of Phillack in the county of Cornwall, gentleman, deceased, who died 12 February 1865 at Phillack aforesaid, was proved 19 April at Bodmin by the oath of Mary Newson (wife of John Newson, porter) of Phillack aforesaid, the sole executrix. Effects under £300. 5