Samuel Riley seems to have been known in the family as 'Riley' (see obituary and 1891 census).
He was the son of James and Martha Waterfield who had eight children born living (Florence Jane, Clarence, Sarah, James, Samuel Riley, William P, Mary E and Elizabeth) of whom six were alive at the time of the 1911 census.
Martha was born in Belper and James was baptised at St Peter's church, Belper, on 10 August 1879. His father, James, also came from Derbyshire, having been born in Milford.
James (35, mechanic) and Martha were living in Burbage, Leicestershire, at the time of the 1881 census; they had four children at home, Florence J (12), Sarah (10), James (9) and Samuel R (2).
By 1891 the family was living at 56 St Ann's Well Road, Nottingham, and there were five children in the household: Clarence (22), James (19), Riley [Samuel Riley] (12, scholar), William P (8) and Mary E (5).
They were still at the same address in 1901 but only three children were at home; Flora [Florence] (32, cotton winder), William P (18, insurance clerk) and Elizabeth (15, born Kimberley, in work).
In 1911 James and Martha were living at 2 Newdigate Villas, Newdigate Street, Nottingham, with their daughter, Florence Jane Teather (42) and son-in-law William Henry Teather (62), who had married in July 1908 and were listed as boarders.
Riley's mother, Martha, died in April 1913 and when Samuel Riley was killed in May 1916 his father was still living at Newdigate Villas.