John was born around the end of July or into August 1900 to parents John Penn Milton Snr and Alice Ellen and christened at St Mary's Church Penzance, Cornwall, on 20th August 1900. He was recorded again the following year aged 8 months old on the 1901 census, living at 13 North Parade in Penzance.
10 years later he was listed on the 1911 census, then a schoolboy, living in a full house at Udal Torre, Yelverton with his parents, a sister, two cousins, a governess, a nurse and 6 servants.
Unfortunately no records exist between the census and his posting to the Vanguard except for the date he joined the dreadnought on 1st May 1917.
He was aboard the ship for just 9 weeks before he was killed, aged 17.
#266 - 549/843
Sources:
England & Wales, Civil Registration Birth Index, 1837-1915 Free BMD
England, Select Births and Christenings, 1538-1975
1901 & 1911 England Census
Royal Naval Officers' Service Records Index, 1756-1931
UK, Navy Lists, 1888-1970
British Army and Navy Birth, Marriage and Death Records, 1730-1960 National Archives of the UK; Kew, Surrey, England; Admiralty and predecessors: Office of the Director General of the Medical Department of the Navy and predecessors: Service Registers and Registers of Deaths and Injuries. Registers of Reports of Deaths
CWGC Register
Ancestry - photo