It seems that Edward may have named his daughter Violet for his sister who died in an accident in 1916.
Evidence that this is the same family:
John W Turner m Sarah A Brown, Q1 1911 Sunderland
Edward W Turner, birth, 1912 Q4 Sunderland, mmn Brown [1939 register has birth date 28/9/12]
Violet W Turner, birth, 1914 Q3 Sunderland, mmn Brown
Violet W Turner, death, 1916 Q3, Sunderland, age 2
The article says that the father of this Violet Wardropper Turner is a leading stoker. Looking at JWT's navy record he was indeed a stoker around that time (Stoker Petty Officer on HMS Cornwallis). In fact, he was still with HMS Cornwallis in January 1917 when she was torpedoed and sunk off Malta (most of the crew survived).
1 August 1916: Sunderland Daily Echo and Shipping Gazette