I also found all the census returns, a will, service records and managed to contact a relative, all through Ancestry.com.
I went the extra step with Lamont and bought the War Diary for his battalion, it doesn't mention him by name but gives a clear picture of what his battalion experienced in the war.
Lamont Grave was born in 1891 and his birth was registered in the third quarter of the year in West Derby, Liverpool. He was christened 13th December 1891 in Edge Hill, Liverpool. His parents were William and Margaret Grave. (William Grave and Margaret Anne Lamont, daughter of Archibald Lamont, were married 2nd July 1888 in Edge Hill) The 1891 census shows that Lamont's parents and his older sister Elizabeth lived at 22 Winifred Street, Liverpool.
In 1898 on the christening record for his sister Isobel Lilian, their parents were recorded as living at 7 Upper Stanhope Street and William was a sorting Clerk.
In the 1901 census Lamont was 9 years old and, along with his 3 sisters, was enumerated at the house of his aunt and uncle (John and Jane Wagner) at 43 George Street.
Lamont's father and 4 year old sister Lilly were enumerated in the 1901 census at 7 Upper Stanhope Street as boarders at the house of Alice Grave, a widow and probably Lamont's aunt. Margaret is enumerated as a boarder in Hurry Street, Toxteth Park and working as a laundress. They may have been separated.
Lamont's mother died on the 3rd May 1910 in Liverpool, her will shows that she left £50 which went to her youngest daughter Isobel Lilian Grave (spinster)
In the 1911 census Lamont, his three sisters and his father (now a widower) were all at the house of another aunt and uncle, Joseph and Mary Littlar of 6 Egerton Road, Wavertree. Lamont was 19 and employed as a merchant salesman.
Lamont's attestation paper shows that he lived at 140 Alderson Road, Wavertree, He signed up on 6th Nov 1914 for 4 years with the Territorial Force and was posted to the 10th Battalion The King's (Liverpool) Regiment (The Liverpool Scottish) with the regimental number 3969.
He embarked for France on 23rd January 1915 and joined his unit on 30th January. He went missing in action on 16th June 1915.
Lamont went missing on 16/6/1915 but it wasn't until 27th May 1916 that the War Office issued form b.2090c 'Death- acceptance of for official purposes' then on 28th August 1916 his personal effects - one identity disc - were sent to his sister Elizabeth Gladys Dutton of 140 Alderson Road, his next of kin, she also received his plaque, scroll and medals.
the probate record for his will (below) shows that he left his money (£171) to his sister Elizabeth Gladys.
Here is a transcript of the War Diary for the Liverpool Scottish on the day Lamont went missing:
Many thanks to Lynda for sharing these photographs of a family picture of Lamont.