Looking at free bmd, William and Minnie had a number of children
Violet May Jacka 1903 Redruth
Hilda May Jacka 1904 Redruth
However there are listed on the census as being the children of David henry Watkins and Minnie and there are two other children, Hilda and Reginald listed, but I cannot find them on the free bmd, plus Violet's age on the census is inaccurate by four years
Pretty confusing