These photographs were taken on 27th January 2018 and what is unusual about them is that they show a replacement memorial.
The original memorial is shown below
My interest was in their younger son Fred
"Also of FRED the youngest son of the above named HENRY & ANNIE DAWSON who died on active service Oct 20th 1915 in his 18th year."
A check on the GWGC database gave the following information
Lance Corporal DAWSON, FRED
Service Number 17510
Died 20/10/1915
Aged 18
6th Bn - York and Lancaster Regiment
Buried PORTIANOS MILITARY CEMETERY IV. B. 212.
Son of Mrs. Annie Dawson, of 42, Vernon Terrace, Manchester Rd., Sheffield.
6th Bn - York and Lancaster Regiment
Aug 1914 Formed at Pontefract as part of the First New Army (K1) and then moved to Grantham as part of the 32nd Brigade in the 11th Division and then moved to Witley by April 1915.
03.07.1915 Mobilised for war and embarked for Gallipoli from Liverpool via Mudros.
0.08.1915 Landed at Sulvla Bay and engaged in various actions against the Ottoman Empire including; The Battle of Scimitar Hill and attack on Hill 60.
Dec 1915 Evacuated to Mudros due to serve casualties from combat and disease.
And so it appears that Fred died from his wounds or disease in Greece after service with his regiment in Gallipoli
He is remembered as well on
Sheffield Council Official Roll of Honour
Ranmoor War Memorial
St John The Evangelist Church Ranmoor Roll of Honour
The original headstone must have been erected circa 1939 - the first burial in the grave was that of Fred's father Henry. You can clearly see the effects of 80 years of Crookes weather on the stone but it is refreshing to see that they are not forgotten after all these years. Someone still cares
DAWSON, Annie (Widow, age 98).
Died at 42 Vernon Terrace; Buried on January 19, 1953 in Consecrated ground;
Grave Number 313, Section AA of Crookes Cemetery, Sheffield.
Plot Owner: of ~. Page No 201
DAWSON, Henry (Retired, age 81).
Died at 42 Vernon Terrace; Buried on December 30, 1959 in Consecrated ground;
Grave Number 313, Section AA of Crookes Cemetery, Sheffield.
Plot Owner: of . Page No 294
DAWSON, Henry (Retired, age 91).
Died at 42 Vernon Terrace; Buried on January 4, 1939 in Consecrated ground;
Grave Number 313, Section AA of Crookes Cemetery, Sheffield.
Plot Owner: of ~. Page No 327
DAWSON, Kate (Spinster, age 92).
Died at Lodge Moor Hospital; Buried on August 4, 1967 in Consecrated ground;
Grave Number 313, Section AA of Crookes Cemetery, Sheffield.
Plot Owner: of . Page No 16
HARRISON, May (~, age 91).
Died at 3 Barncliffe Road; Buried on April 11, 1983 in Consecrated ground; cremated.
Grave Number 313, Section AA of Crookes Cemetery, Sheffield.
Remarks: Cremated remains removed from City Rd No 312633.
Plot Owner: of ~. Page No 122
HARRISON, Victor (~, age 72).
Died at 3 Barncliffe Road; Buried on January 31, 1973 in Consecrated ground; cremated.
Grave Number 313, Section AA of Crookes Cemetery, Sheffield.
Remarks: Cremated remains removed from City Rd No.95849.
Plot Owner: of . Page No 58