In 1814 John was named as a beneficiary in his father's will, to receive £1 1s. when he turns twenty-one.
In 1841 John Trewhella, aged about 40, born in the county, tin miner, and wife Ann Trewhella, aged about 45, born in the county, were living in Halse Town, St. Ives, Cornwall.
------------------------
John Trewhella of Trelion in St. Ives died aged 54 years (burial record).
------------------------
At Trelion, in the parish of Lelant, on Sunday last, Mr. John Trewhella.
The West Briton and Cornwall Advertiser, Friday, 12 Apr 1850, p. 3
------------------------
Abstract of the Will of John Trewhella of the Parish of St. Ives in the County of Cornwall, written 28 Aug 1849, proved 9 Jul 1850. 2
Gives his house situated in Trelyon in the parish of St. Ives to his wife Ann Trewhella, along with his household furniture, his watch and all the rest of his effects.
(Signed)
Witnesses: Thomas Coger, Samuel Adcock Ellis
Effects under £100.